Avacha Bay
Avacha Bay is a Pacific Ocean bay on the southeastern coast of the Kamchatka Peninsula. It is long and wide, with a maximum depth of.
The Avacha River flows into the bay. The port city of Petropavlovsk-Kamchatsky and the closed town of Vilyuchinsk lie on the coast of the bay. It is the main transport gateway to the Kamchatka region. The bay freezes in the winter.
It was first discovered by Vitus Bering in 1729. It was surveyed and mapped by Captain Mikhail Tebenkov of the Imperial Russian Navy in the 1830s.
Avacha Bay was the scene of a massive die-off of benthic marine organisms in September–October 2020.
Situated on the south end of the bay in Vilyuchinsk is Russia's largest submarine base, the Rybachiy Nuclear Submarine Base, established during the Soviet period and still used by the Russian Navy.