Yam is the deity of the primordial chaos and represents the power of the sea, untamed and raging; he is seen as ruling storms and the disasters they wreak. The gods cast out Yam from the heavenly mountain Sappan (modern Jebel Aqra; Sappan is cognate to Tsephon). The seven-headed dragon Lotan is associated closely with him and he is often described as the serpent. He is the Canaanite equivalent of the Sumerian Tiamat, the primordial mother goddess.
Of all the gods, despite being the champion of El, Yam holds special hostility against Baal Hadad, son of Dagon. Yam is a deity of the sea and his palace is in the abyss associated with the depths, or Biblical tehwom, of the oceans. (This is not to be confused with the abode of Mot, the ruler of the netherworlds.) In Ugaritic texts, Yam's special enemy Hadad is also known as the "king of heaven" and the "first born son" of El, whom ancient Greeks identified with their god Cronus, just as Baal was identified with Zeus, Yam with Poseidon and Mot with Hades. Yam wished to become the Lord god in his place. In turns the two beings kill each other, yet Hadad is resurrected and Yam also returns. Some authors have suggested that these tales reflect the experience of seasonal cycles in the Levant.