The Opasnost Rocks (, Japanese: ) is an islet group of rocks, in La Pérouse Strait and the Sea of Okhotsk.
The Opasnost Rocks are located around southeast of Cape Crillon, the southernmost point of Sakhalin island.
It is a small group of bare rocks, devoid of vegetation. Its length is , its width is , and its highest point is approx. .
The rocks were a great hindrance to marine traffic in La Pérouse Strait, aggravated by frequent dense fogs in the summertime. To avoid possible collision, ships had to set some of their crew members on guard to locate the rocks by listening to the roar of sea lions living on it. A lighthouse was finally constructed on the rocks in 1913, during the Japanese administration of the area. Today, the lighthouse is powered by a radioisotope thermoelectric generator.
In the 1930s, the rocks were an obstacle along one of the routes taken by ships carrying enslaved political prisoners to the port of Magadan for transfer to the Gulag mines in Kolyma.