Ketoy Island

Ketoy is an island located in the Great Range of Islands of the Kuril Archipelago. It is part of the North Kuril district, Sakhalin region, the Russian Federation. The island is currently uninhabited.

The shape of the island is almost round, the area is about 73 square kilometers, the highest point is the eponymous Mount Ketoy, 1166 meters high. Also here is the active volcano Pallas, 990 meters high. In the center of the island is the caldera freshwater lake Malakhitovoe, 110 meters deep, 1.6 kilometers wide. From the lake flows stream Stochny, which then flows into the ocean. In the crater of the volcano there is also Lake Glazok, 40 meters deep, 300 meters wide. This lake contains acidic water. In the north of the island is the Cascade waterfall.

The island is the northern limit point of distribution of pointed yew and Kuril bamboo. Also here grows ash, alder, cedar stlane, low birch. On the island there are foxes and small rodents, there are rookeries of a seal and a flock.

The island is separated by the Ricorda Strait, from Yankic Island, by the Diana Strait from Simoushira Island.