Nipesotsu-Maruyama volcano is a group of overlapping stratovolcanoes and lava domes located east of Nukabira Lake and about 20 km east of Tokachi-dake volcano on Hokkaido Island, Japan.
The only historic eruption was a minor phreatic explosion from Maru-yama ("round mountain") lava dome in 1898. Fumaroles are located at the summit crater.
The Nipesotsu-Maruyama volcano group (ニペソツ・丸山火山群 Nipesotsu-Maruyama-kazangun) contains andesitic-to-rhyolitic stratovolcanoes and lava domes which are aligned NW-SE.
They overlap the SW rim and SW caldera floor of the Pleistocene Tokachimitsumata caldera. The highest peak in the complex is 2013-m-high Nipesotsu-yama (ニペソツ山) stratovolcano, which was active about 400,000-200,000 years ago.
The Maruyama stratovolcano and lava dome at the southern end of the complex were discovered to be a Quaternary volcano only in 1989. It is also referred to as Higashi-Tokachi-Maruyama to distinguish it from several other volcanoes named Maru-yama including the Maru-yama lava dome which erupted in 1898.
(Source: Smithsonian / GVP volcano information