Lake Towada is the largest crater lake in Honshū island. Lake Towada occupies the caldera of an active volcano, with large scale volcanic eruptions occurring approximately 55,000, 25,000 and 13,000 years ago. In 1936, the lake and surrounding areas became part of Towada National Park. The most recent eruption left traces of pyroclastic flows as far away as the modern city of Aomori. The lake is a popular tourist destination.