Ku's Domain is a location in A Link Between Worlds.
Features and Overview
Ku's Domain is a lake located in the northeast region of Lorule, counterpart of Zora's Lake in Hyrule. It is located directly south of Lorule's Death Mountain, whose runoff creates the huge waterfall that forms the northern border of Ku's Domain.
Upon entering Ku's Domain, Link will be attacked by a group of Kus, who will either chase after Link on land, or attack him from the water by shooting fireballs. After defeating them all, a Silver Rupee pops out of the water. Every subsequent time Link returns to Ku's Domain and defeat all Ku's, he will get a Red Rupee instead.
A lost Maiamai can also be found underwater to the west.