Located next to Beitou Hot Spring Park in Taipei, the Geothermal Valley is one of the hot-spring sources for the Beitou area. The hot spring flowing out from this source is also known to be of the highest temperature in the Datun Mountain area. It was once known as the Hell Valley or the Ghost Lake due to several incidents of tourists in the early days. The Valley is now surrounded with fences to keep visitors from boiling eggs and/or cooking, but people can still enjoy warming up their feet in the ditch. Well known for its jade-like spring covered with mists, this Valley was one of the eight most spectacular views among the twelve scenic attractions in Taiwan during the Japanese colonial rule period.