In Hmong belief, the Dragon King, the oldest of the dragons who live in the Otherworld. He controls the waters which surround the flat earth (which rests on the shoulders of four giants) as well as the rains which fall upon the earth and ensure bountiful harvests. Zaj Laug lives in a palace at the bottom of the sea, attended by servants in the shape of fish. He often assumes the form of a rainbow (zaj sawv).
It is believed that large pools and lakes, called lub pas zaj, are inhabited by dragons and are better left undisturbed.
- Cooper, R., ed. (1998). The Hmong. Singapore: Times Editions Pte Ltd.