Commons:Photo challenge/Submitting
2026 – May – Oceanography
The new challenge features Oceanography.
The challenge will remain open for submissions throughout May UTC.
Checklist for this theme:
- Photographs must be the work of the nominator.
- Photographs must be newly uploaded to Commons during the challenge submission period i.e. May 2026 UTC (but may have been taken earlier).
- Submissions must be added to the top of the "Entries" section below.
- Please do not nominate lots of similar photos; instead choose just your best and most varied images.
Add your entry between the <gallery> tags as indicated. Gallery entries are placed each on a new line, and consist of the filename, a vertical bar |, and a description. For example:
Electric steam iron.jpg|An electric steam iron
- Restriction: A maximum of four entries can be submitted per photographer.
There are 7 days 20 hours left before this challenge ends. (refresh)
Examples
Entries
- Sea urchin on the sand in the Persian Gulf.
- A specimen of a blue whale
- Corals at the Museum of the World Ocean, Kaliningrad
- Sperm whale skeleton, Museum of the World Ocean, Kaliningrad
- Bivalve clam in the intertidal zone, Tersky Coast of the White Sea
- Chamelea gallina shells in the intertidal zone, Tersky Coast of the White Sea
- Rotes Meer - Marsa Alam. Hotel The Three Corners Equinox Beach Resort. Ägypten.
- Ägypten, Rotes Meer. Das Korallenriff am Grand Makadi Hotel, Makadi Bay.
- Former research vessel "Lance" of the Norwegian Polar Institute at the pier of the research station Ny Ålesund, Svalbard, Norway, 1986 (Scan of a slide)
- Former research vessel "Gauss" of the Federal Maritime and Hydrographic Agency (BSH), Port of Hamburg, Germany, 2003 (Scan of a slide)
- Underwater laboratory "Helgoland", in operation from 1972 to 1981, Meeresmuseum Stalsund, Nautineum Dänholm, Rügen Island, Germany
- Hydrological computer equipment (around the late 1980s), Meeresmuseum Stalsund, Nautineum Dänholm, Rügen Island, Germany
- Praterie di Posidonia oceanica, fondali oltre la costa di Marciana Marina (Isola d'Elba)
- Coral reef under the Arabian Sea
- It is a Beach Morning Glory flower that grew on the sandy beach of Lakshadweep, India.
- This is a Horned Ghost Crab on the beach of Lakshadweep, India.
- The dissection of a beached Sei Whale (Balaenoptera borealis)
- A specimen of Japanese giant spider crab (Macrocheira kaempferi).
- Penguin at the Tennōji Zoo viewed from below
- Piranha, Pygocentrus nattereri in Montreal Biodome (Canada)
- A junk tire was trapped on Laomei Green Reef.
- Ancient diver in the Museum of the World Ocean
- German Wadden Sea at low Tide: clusters of coiled castings of lugworms (Arenicola marina)cover the mud flats and a washed up barrel jellyfish (Rhizostoma pulmo) in the foreground
- Laboratory Experiment at Helmholtz Centre for Ocean Research Kiel (GEOMAR): Environmental tolerance of different populations of native Gammarus species
- Geomar’s research vessel FS Alkor moored at the quay in the port of Kiel, out of action due to the coronavirus pandemic
- The research vessel FS Polarstern of Alfred Wegener Institute for Polar and Marine Research (AWI) in Bremerhaven
- A Harbour porpoise (Phocoena phocoena) washed ashore in the North Sea, Rømø island, Denmark
- Taken at Blackpool Beach, overlooking the Irish Sea
- Bathyplane "Tetis" in the Museum of the World Ocean
- Crab (Grapsus tenuicrustatus) on the coast of Salalah, among rocks in the lagoon of the Arabian Sea - part of the Indian Ocean.
- Little life trying to survive underwater
- More such greens going to retain the water bodies
- Too polluted to enter in?
- Plastic plastic everywhere
- Where the day begins in gold.
- Archaephippus Asper, replica
- Seagulls circling a Ferry Service from Mumbai Port to Alibaugh in Arabian Sea
- The underside of the arm of the starfish Marthasterias glacialis
- Hakurei, a marine resource research vessel of Japan Organization for Metals and Energy Security (JOGMEC).
- Shell Collection
- Thornback ray (Raja clavata), a juvenile seen from below. Bergen, Norway
- African penguin colony at Boulders Beach in Simon's Town, South Africa
- big white spider conch shell approximately 23 cm long and 17 cm wide
- Geomorfologia di un tratto della Costa di Aljezur sull'Oceano Atlantico e presso la foce del fiume Seixe (Portogallo)
- Francobollo Italiano del 1978, serie 'il Mare deve vivere', Cernia (Epinephelus marginatus).
- Historic specimen of a shark, Strahov Library, Prague
- Historic specimens of rays, Strahov Library, Prague
- Historic specimens of oceanic creatures, Strahov Library, Prague
- Historic specimens of crabs, Strahov Library, Prague
- Banded triangle clam (Donax trunculus) on the beach of Sérignan Plage, FR
- Mediterranean shore crab (Carcinus aestuarii) on the beach of Sérignan Plage, FR
- Pulmonary jellyfish (Rhizostoma pulmo) on the beach at Sérignan Plage, FR
- General Sea Fisheries Inspectorate, field office in Ustka seaside resort
- Sunrise at Elliot's Beach,Chennai, India
- Get set ready for fishing at the sunrise
- Ocean viewed from old weathered stone arch
- Setting sun in ocean coloring the sky pink
- One Shoreline, one fisherman awaiting the catch
- Atlantic sturgeon (Acipenser oxyrinchus) in Biodôme de Montréal (Canada)
- Small-spotted catshark (Scyliorhinus canicula).- Nausicaá (Boulogne-sur-Mer) France
- A group of pelicans and other aquatic birds gathered on some rocks on the shore at the La Jolla Shores Beach.
- Ausstellung zu regionalen Sardinenfischerei und -konservierung.
- Abandoned Strand Jetty, South Africa: marine life clings to weathered timber where ships once docked.
2026 – May – Horizontal lines
The new challenge features Horizontal lines.
The challenge will remain open for submissions throughout May UTC.
Checklist for this theme:
- Photographs must be the work of the nominator.
- Photographs must be newly uploaded to Commons during the challenge submission period i.e. May 2026 UTC (but may have been taken earlier).
- Submissions must be added to the top of the "Entries" section below.
- Please do not nominate lots of similar photos; instead choose just your best and most varied images.
Add your entry between the <gallery> tags as indicated. Gallery entries are placed each on a new line, and consist of the filename, a vertical bar |, and a description. For example:
Electric steam iron.jpg|An electric steam iron
- Restriction: A maximum of four entries can be submitted per photographer.
There are 7 days 20 hours left before this challenge ends. (refresh)
Examples
Entries
- Ecocathedral in Mildam municipality of Heerenveen, Part of surplus building material stacked in a special way.
- Knitted pullover for a member of our family, self made.
- Bridge across the Teriberka River
- Pumping station at the oil terminal
- No way
- View from Pferdskopf looking west towards the Taunus mountains in a distance of 108 km
- 2026 Miami GP grandstand aspect
- Kornwerderzand Museum. Detail of casemate with firing slit.
- Rangierbahnhof Limmattal, seen from a train
- Round led lights above wooden beams
- Mantis religiosa
- Disk golf disks
- power pole on a bright day.
- Sonnenblumenfeld bei Glaubitz. Landkreis Meißen in Sachsen.
- Painted staircase in the museum "Pommersches Landesmuseum", Greifswald, Germany
- Boardwalk at geyser "Old Faithfull", Yellowstone National Park, WY, USA
- Painted staircase on Via Camillo Benso Conte di Cavour (artist: Carlo Coniglio), Noto, Italy
- Terraces of copper mining, Bingham Canyon Mine, southwest of Salt Lake City, UT, USA
- Photo of some electricity cables taken on Navalagamella
- Taken on the ground floor of the Museu de les Ciències Príncipe Felipe
- Sonnenuntergang über den Atlantik, betrachte von Faial
- Blick in den Braunkohle-Tagebau in Inden (Rheinland)
- Impression am Rhein-Herne-Kanal
- Ansicht des Rhein von der Halde Rockelsberg auf die gegenüberliegenden Hafenanlagen, Duisburg
- Fencing Lines protection at Cubbon Park, Bengaluru, India
- Tourists leaning at parapet lines of Dolphin's Nose View Point at Coonoor, Nilgiris
- Pattern of Lines at Parry's Corner, Chennai, India
- View through window grid lines of Government Museum at Bengaluru
- Time ON LINE
- Okayama Castle seen through an art installation
- Interior of Senjokaku, Toyokuni Shrine, Miyajima
- Atrium of Kojimachi NS Building, Tokyo
- Circular window corridor at Yokosuka Museum of Art
- Grand Canyon West – panoramic view from Guano Point
- Staff gauge on Buffumville Dam
- Saint Pétersbourg Doors of Saint Isaac's Cathedral, Russia
- Terp fan de Takomst near Blije is located in Noard-Fryslân Bûtendyks. Part of the project in progress.
- City Landscape on Horizontal Line
- Unterführung Essen Hauptbahnhof_Lichtinstallation
- Sonnenaufgang über dem Roten Meer. Makadi Bay, Ägypten.
- Spitfire showing off the invasion stripes on the underside of its wings.
- Red Arrows flying in formation leaving behind parallel smoke trails.
- Praga R1 with a livery showing aerodynamics inspired lines across the car.
- JR Kyushu Station Hotel Kokura in Japan
- Mohnfeld bei Grumbach in Sachsen. Landschaftsschutzgebiet Mulden- und Chemnitztal.
- Stromnetz. Seiltausch für höhere Übertragungsleistung
- Dado Sura above Breil/Brigels. Skihut/restaurant Alp Dado Sura (2070m.) Terrace fence.
- A street stage decorated in the national Yakut style
- A street stage decorated in the national Yakut style
- Staccionate di legno lungo il ruscello alle Terme di Sorano (Toscana)
- 橱窗内的滑雪者与水平线
- Port Adelaide View 1
- Port Adelaide View 2
- Esposizione di vasi fioriti nel borgo di Santa Fiora (Toscana)
- Observation deck at the funicular station on Hrebienok, High Tatras, Slovakia.
- Strings of a grand piano
- Hâble d'Ault seen from Cayeux-sur-Mer, France
- Chambre à 6 lits, sous-marin le Redoutable
- Lesser Yellowlegs in a puddle.
- Miami street view from Brickell City Center
- Buildings in Toronto
- Life philosophy sign
- Tunnel ventilation at Vienna Central Station, with butterfly bushes growing in front of it
- Yellow markings on the Luchtsingel Path, an expensive project launched in 2015 to improve the quality of life in Rotterdam, but which soon fell into disrepair
- Yards and masts of the cargo-carrying iron-hulled sailing ship Peking, now a museum ship in Hamburg, Germany
- Steel steps of the Elia artwork after a rain, Birk Centerpark, Herning, Denmark
- Shop display at Munich Central Station, D.
- Eglise Saint-Joseph, Paris, F.
- Wooden shoes on Ameland, Netherlands.
- Oystercatchers on Ameland, NL.
- Horisontal bars of tram poles in Dnipro, Ukraine.
- Schlechtes Wetter für Biergärten
- Bank im Hafen von Stralsund
- Horizontal vineyard wires in a vineyard in contre-jour
- Hikers walk through a horizontal snow bridge
- Horizontal tyre casts on a sandy beach
- Lawn edge in a front garden
- Horizontal lines of the chairlift for skiers from Štrbské Pleso to Solisko - Furkota, High Tatras, Slovakia.
- Picketing workers and students rally on Revson Plaza above Amsterdam Avenue during the 2021 Columbia strikes
- Trackage at NYC's Marble Hill–225th street station
- Rapsfeld beim Hohndorf. Erzgebirgskreis, Sachsen.
- Escalator of Chernyshevskaya metrostation in Saint Petersburg
- The Mekong, in Laos, near Pak Beng
- Is this man washing the windows or painting clouds
- Crescent Moon next to Venus at 5:40am in Brasilia, DF Brazil
- underside of the JK Bridge in Brasilia, DF Brazil dissapearing into the morning fog
- a mural on the wall with a checkerboard sidewalk. Brasilia, DF Brazil
- Caught the Sun red handed
- Love locks filled bridge railing
- Towards end of the life
- Flexible shelfs of the study room
- Red and white - vertical and horizontal lines
- Small abandoned building through a glass-less window
- sky is the limit
- the Dusk
- Sunset over Lake Kownackie, Mrówki, Poland
- Sunset on the beach in Santa Monica, California, USA
- Exterior of Sound barrier wall while a bus was running on the elevated road at night.
- Dot pattern zebra crossing with Vehicle light trails in Bade District, Taoyuan City at night
- Mezereon in the nature reserve Murnauer Moos
- window
- Warehouse wall
- Chikurin-ji temple in Kochi, Japan
- Balconies in PMQ, Hong Kong
- Beach hut in Southwold, Suffolk, England
- Beach huts at the Plage de Calais, France
- Vineyard in Kallstadt, Palatinate, Germany with trellising
- garden bench in winter
- Shadows on a sidewalk, Zakopane, Poland
- Horizontal and vertical lines of Victoria Palace facade, Prague, Czechia
- Pankrác metro station, reopened after reconstruction, with partially attached marble siding; Prague, Czechia
- Municipal district office of Prague 15, Czechia
- Lijnenspel, een foto gemaakt van kunstwerk gemaakt door Anja Namink
- Book-shaped tree bark specimen in a Xylotheque in the Strahov Library, Prague
- Esslingen city wall, steps to the castle, GER
- Erasmus Bridge in Rotterdam open for ships
- Les Planches beach promenade in the French seaside resort of Deauville
- Stone bridge of Hohenrechberg Castle, GER
- Crepuscular rays cloudy sky seaview with a moving line of jet skiing on the Bashi Channel sea in the afternoon
- Nature Landscape from Seaview tower in Kenting Forest Recreation Area on February 18
- Bridges in Ustka
- Stairs connecting the Lone Poplar and the Holy Spring, Protected Area in the Republic of Kalmykia
- Horizontal Lines in a field of Verlinghem (Fr)
- Horizontal Lines in a school building in Howrah City
- Horizontal Lines created by Bus in Howrah City
- Soffitto decorato nella Camera del Baldacchino, Castello Orsini-Odescalchi di Bracciano
- Lanterns in Kasuga-taisha shrine (Nara, Japan)
- Last trip of the bird while the sunset
- Rustic steps rising upwards
- Parallel lines for drying the clothes
- Sweating iron
- A cat stares out of a window, surrounded by horizontal siding, in Duluth, Minnesota in the Central Hillside neighborhood.
- Cuneiform on clay cylinders dedicated to Iddin-Dagan, Louvre-Lens museum (Fr)
- The horizon holds secrets only the sky understands.
- Over the Horizon
- Sea view at Naminoue Umisora Park, Naha, Okinawa
- Stormy sunset over La Gomera
- Strand railway station is the main railway station of Strand and sounrounding towns
- Building on Strand beachfront at twilight.
- Shoes in the corner
- Stairs in the forest.

