Okhotsk-Chukotka Volcanic Belt

The Okhotsk-Chukotka Volcanic Belt (OCVB) is a Cretaceous volcanic belt in the Russian Far East region of northeast Asia. 
It is found in Chukotka Autonomous Okrug and Khabarovsk Krai of northeastern Russia.
Geology.
The volcanic belt is one of the largest subduction-zone related volcanic provinces in the world, stretching some and comprising about 2 million km3 of volcanic and plutonic material. 
The volcanism within the volcanic belt was related to the subduction of the ancient Kula Plate, which moved in a northward direction about 55 million years ago.