Avacha Bay () is a Pacific Ocean bay on the southeastern coast of the Kamchatka Peninsula. It is long and wide (at the mouth), 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 has been the scene of massive die-off of benthic marine organisms in September-October 2020. Description The Avacha Bay is one of the largest bays in the world able to fit any ship in the world. It is an internal part of Avacha Gulf. Total area is 215 square kilometers. Depth – up to 26 meters. Main rivers flowing into the bay – Avacha and Paratunka. It is the home base of the Russian Pacific fleet. See also Tri Brata – "Three brothers", a major landmark in the bay References Bays of Kamchatka Krai Bays of the Pacific Ocean Bodies of water of the Kamchatka Peninsula Pacific Coast of Russia Volcanoes of the Kamchatka Peninsula Calderas of Russia Extinct volcanoes Submarine calderas 2020 disasters in Russia