Sea serpents

thumb|upright=1.1|The Destruction of Leviathan by Gustave Doré (1865) thumb|upright=1.4|The circular salt sea Tiamat (green) and sphere of cosmic freshwater ocean [[Abzu are pre-existent deities in Sumerian myths, from whose mating Earth was created, so the sketch's side view shows the same as Babylon's map. Referring to the Atra-Hasis epic, Abzu is the celestial reservoir from which an organisation of younger gods triggers the Flood in order to consume humanity – also a source for the dangerous cosmic sea monster Leviathan.]]

thumb|Jörmungandr in the sea during Ragnarök, drawn by the Norwegian illustrator [[Louis Moe in 1898.]] In Norse mythology, Jörmungandr (, see Etymology), also known as the Midgard Serpent or World Serpent (, "worm of Midgard"), is an unfathomably large and monstrous sea serpent or worm who dwells in the world sea, encircling the Earth (Midgard) and biting his own tail, an example of an ouroboros. As a result of him surrounding Midgard, the beast is referred to as the World Serpent. Jörmungandr releasing his tail is one of the signs of the beginning of Ragnarök.

mythological creature

The Ogopogo is a lake monster said to inhabit Okanagan Lake in British Columbia, Canada in Canadian folklore. Some scholars have charted the entity's development from First Nations folklore and widespread water monster folklore motifs. The Ogopogo now plays a role in the commercial symbolism and media representation of the region.

sea monster or large sea creature, associated with Andromeda of Greek myth

Cadborosaurus, nicknamed Caddy by journalist Archie Wills, is a sea serpent in the folklore of regions of the Pacific Coast of North America. Its name is derived from Cadboro Bay in Greater Victoria, British Columbia, and the Greek root word "saurus" meaning lizard or reptile.

basking shark corpse caught by the Japanese fishing trawler Zuiyō Maru off the coast of New Zealand in 1977

Sea carcass found in Scotland in 1808

Apalāla is a water-dwelling Nāga in Buddhist mythology. It is said that Apalāla lived near the Swat River, this area is currently located in Peshawar, Khyber-Pakhtunkhwa Province, Pakistan. He is known to be a Naga King.

Norwegian lake monster

The Bakunawa, also called the Philippine moon-eating dragon, the Philippine moon dragon, moon dragon, or the moon-eating dragon, is a dragon-like serpent in Philippine mythology. It is believed to be the cause of eclipses, earthquakes, rains, and wind. The movements of the Bakunawa served as a geomantic calendar system for ancient Filipinos and were part of the rituals of the babaylan priestess. It is usually depicted with a characteristic looped tail and a single horn on the nose. It was believed to inhabit either the sky or the underworld.

The Oilliphéist (, ) is a sea serpent or dragon-like monster in Irish mythology and folklore.

sea serpent hoax

Japanese fairy tale about a heroic samurai Tawara Tōda, based on real-life figure

Gaasyendietha, also known as the meteor dragon according to Seneca mythology, is a giant serpent that dwells in the deep areas of rivers and lakes of Canada, especially Lake Ontario. This serpent could fly on a trail of fire, and it could also spew fire, which has led to it being viewed as analogous to European dragons.

Irish fairy tale