Heaven Lake, North Korea/China border

Heaven Lake is a A large volcanic crater (filled with water), situated on the border of North Korea and  China, The lake is located on top of Baekdu (Baekdudaegan) Mountain. The crater was created in a volcanic mountain erupted in roughly - around 950 AD. It is believed by locals that a monster inhabit the lake (referred as”Lake Tianchi Monster”), last sight of the monster was in 2007, when Zhuo Yongsheng,(Chinese TV reporter) calmed to shot a 20 minute video of six unknown creatures with giant wings.

For more information visit Wikipedia - Heaven Lake
For more information about the “Lake Tianchi Monster” visit Wikipedia - Lake Tianchi Monster

Heaven Lake is located on google maps.