Lake Towada

Lake Towada fills a volcanic caldera among the mountains of northern Honshū. Two peninsulas enclose a smaller basin in its southern part, formed by later volcanic activity within the older caldera. An eruption in 915 sent pumice and ash over the region and gave rise to the Ogurayama lava dome. The Oirase River flows out of the lake through a wooded gorge, past rapids and waterfalls.