A steaming lava dome partially fills the breached summit caldera of Berg volcano, with conical Kolokol volcano in the background to the south. They are part of a group of Holocene volcanoes in central Urup Island that is named after its most prominent volcano, Kolokol. Berg and Trezubetz volcanoes, flanking Kolokol on the NW, have breached summit calderas partially filled by lava domes. Kolokol volcano rises to 1328 m and is sometimes known as Urup-Fuji because of its symmetrical profile. Photo courtesy of Alexandr Rybin (Institute of Marine Geology and Geophysics, Yuzhno-Sakhalin).