The Chirpoy Islands are a pair of uninhabited volcanic islands located between Simushir and Urup in the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean. Called the Black Brothers for their striking black lava cliffs and dark-hued terrain, the larger is named Chirpoy and the smaller Brat Chirpoev (Russian for Chirpoy's Brother). They are the remains of a partially submerged volcanic caldera which measures 8–9 km wide. The two islands are surrounded by a number of small islets and offshore rocks and together, they form the Chernye Brat'ya (Russian for Black Brothers) Islands. Both islands are separated by the Snou Strait.
Chirpoy, the northernmost of the two islands consists of three overlapping volcanoes - in 2012 the volcano named Snow erupted.
Brat Chirpoev, the southern of the two islands, has the tallest volcanoe at 749 metres (2,457 ft). Brat Chirpoy is the site of the southernmost of five major Steller sea lion rookeries on the Kuril Islands.
There are no cruises currently listed for this port of call.