The volcanoes in Yukon are part of the circle of volcanoes around the Pacific Ocean known as the Pacific Ring of Fire. Yukon includes more than 100 separate volcanic centres that have been active during the Quaternary. The Fort Selkirk Volcanic Field in central Yukon is the northernmost Holocene volcanic field in Canada, including the young active cinder cone, Volcano Mountain. A volcanic field in south-central Yukon is called Alligator Lake volcanic complex. It contains two well-preserved cinder cones that caps a small shield volcano. Lava from the cones travelled north and were erupted at the same time. Volcanoes in south-western Yukon are part of the Wrangle Volcanic Field, which is related to the subduction of the Pacific Plate beneath the North American Plate at the easternmost end of the Avalanche Trench.