Omizunu (), also known as Yatsukamizu Omitsuno () was a Japanese deity, the great-great-grandson of Susanoo-no-Mikoto. He was illustrated as a deer with a tree sprouting from it one the Mandala of the Kasuga-taisha.
He is known for expanding the Izumo Province which he also gave the name to according to Motoori Norinaga. He is worshipped at Kamochi Shrine. and Kamochi Shrine. This was featured in the film Myths of the Izumo Province
The antagonist of Princess Mononoke is Yatsukamizu-Omitsuno, known also as Shishi-gami, . This term primarily referred to sika deer and wild boars.
He has a notable myth recorded in the Izumo Fudoki. The myth of Omitsuno is about making Izumo bigger. He saw Izumo as a small strip of land. He decided to add more land to it. He looked towards Silla for extra land.
Omitsuno used a special spade. It was shaped like a young girl's breast. He used it to cut the land. It was like cutting through fish gills. He cut off pieces of land.
He attached these pieces to a three-strand rope. He pulled this land towards Izumo. He used a lot of strength. The land moved like a boat on a river. Omitsuno encouraged the land by shouting. He said, "Come on, land!"
The new land went from Kozu Bay to the Cape of Kizuki. This area is known for its pure spikes.