AVACHA BAY. The second largest bay in the world, surrounded on all sides by fells and snowy mountain peaks. Avacha Bay is so large that it can accommodate all the world’s fleets. It offers a view of the Koryak, Avachinsky and Vilyuchinsky volcanoes. At the entrance to the bay stands the "Three Brothers" rock, an official monument of nature and the symbol of Avacha Bay and the city of Petropavlovsk-Kamchatsky.