What does the cryptid kur look like?

In Sumerian mythology, Kur was primarily a mountain or mountains, and usually referred to the Zagros mountains to the east of Sumer. The cuneiform for "kur" was a pictograph of a mountain[1] It can also mean "foreign land". Although the Word for earth was Ki, Kur came to also mean land, and Sumer itself, was called "Kur-gal" or "Great Land". "Kur-gal" also means "Great Mountain" and is a metonym for both Nippur and Enlil who rules from that city.[2] Ekur, "mountain house" was the temple of Enlil at Nippur. A second, popular meaning of Kur was "underworld", or the world under the earth.[3] Kur was sometimes the home of the dead[4],it is possible that the flames on escaping gas plumes in parts of the Zagros mountains would have given those mountains a meaning not entirely consistent with the primary meaning of mountains and an abode of a god. The eastern mountains as an abode of the god is popular in Ancient Near Eastern mythology. The underworld Kur is the void space between the primeval sea (Abzu) and the earth (Ma). Kur is almost identical with "Ki-gal", "Great Land" which is the Underworld (thus the ruler of the Underworld is Erishkigal "Goddess of The Great Land". In later Babylonian myth Kur is possibly an Anunnaki, brother of Ereshkigal, Enki, and Enlil. In the Enuma Elish in Akkadian tablets from the first millennium B.C.E., Kur is part of the retinue of Tiamat, and seems to be a snakelike dragon. In one story the slaying of the great serpent Kur results in the flooding of the earth[5]. A first millennium cylinder seal shows a fire-spitting winged dragon--a nude woman between its wings--pulling the chariot of the god who subdued it, another depicts a god riding a dragon, a third a goddess[6]. KUR, as a Word, can also refer to a variety of other things. Cuneiform KUR ? historically means "mountain" but came to refer to "land" in general and as a determiner is placed before the name of a state or kingdom (see also URU). The Assyrian pronunciation is mât.

Long story short he is a leviathan. Often dating back to biblical times and often referenced in The Bible.