Watatsumi

Watatsumi , also pronounced Wadatsumi, is a kami, Japanese dragon and tutelary water deity in Japanese mythology. Ōwatatsumi no kami is believed to be another name for the sea deity Ryūjin and also for the Watatsumi Sanjin , which rule the upper, middle and lower seas respectively and were created when Izanagi was washing himself of the dragons blood when he returned from Yomi, "the underworld". (Wikipedia)