Blue Lake, also known as Blue Lake, is a famous geothermal hot spring in Iceland. Blue Lake is located in Greendavik on the Reykjavís Peninsula in southwest Iceland, 13 km from Keflavik International Airport and 39 km from the capital Reykjavik. Blue Lake is formed by some volcanic lava, the water temperature is about 37 – 39 °C. The lake is rich in minerals such as silicon and sulfur. Soaking in the hot springs in Blue Lake can help treat some skin diseases such as psoriasis.