Avacha Bay (Russian: Авачинская губа, Авачинская бухта) is a Pacific Ocean bay on the southeastern coast of the Kamchatka Peninsula. It is 24 km (15 mi) long and 3 km (2 mi) wide (at the mouth), with a maximum depth of 26 m (85 ft).
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.
The Pacific Fleet (Russian: Тихоокеанский флот, ТОФ, romanized: Tikhookeansky flot, TOF) is the Russian Navy fleet in the Pacific Ocean. Established in 1731 as part of the Imperial Russian Navy, the fleet was known as the Okhotsk Military Flotilla (1731–1856) and Siberian Military Flotilla (1856–1918), formed to defend Russian interests in the Russian Far East region along the Pacific coast. In 1918 the fleet was inherited by the Russian Soviet Federative Socialist Republic, then the Soviet Union in 1922 as part of the Soviet Navy, being reformed several times before being disbanded in 1926. In 1932 it was re-established as the Pacific Fleet, and was known as the Red Banner Pacific Fleet (Краснознамённый Тихоокеанский флот, Krasnoznamyonnyy Tikhookeansky flot) after World War II as it had earned the Order of the Red Banner. In the Soviet years, the fleet was also responsible for the Soviet Navy's operations in the Indian Ocean and Arabian Sea. Following the collapse of the Soviet Union in 1991, the Red Banner Pacific Fleet was inherited by the Russian Federation as part of the Russian Navy and its current name was adopted.
The Pacific Fleet's headquarters is located in Vladivostok with numerous facilities within the Peter the Great Gulf in Primorsky Krai, and Petropavlovsk-Kamchatsky and Vilyuchinsk in Avacha Bay on the Kamchatka Peninsula in Kamchatka Krai. Following the APEC Russia 2012 summit, it was announced that the main naval base of the Pacific Fleet in the Russian Far East will be moved to Fokino. The current commander is Admiral Viktor Liina, who has held the position since April 2023.