Source of outdoor hot springs in Vanke Songhua Lake

there are two theories about the source of outdoor hot springs in Vanke Songhua lake.

1. It is said that these hot spring waters come from Changbai Mountain, which is rich in groundwater and geothermal resources, so it can provide a lot of hot spring water.

2. Another way of saying this is that these hot spring waters come from Songhua Lake itself. In winter, Songhua Lake will freeze, and the hot springs at the bottom of the lake will emit hot water. When the lake freezes, these hot spring water will emerge from the spring at the bottom of the lake, forming an outdoor hot spring.