Introduction to the Blue Lagoon in Iceland: The Blue Lagoon in Iceland, also known as the Blue Lagoon, is a famous geothermal hot spring in Iceland, 39 kilometers away from the capital Reykjavik. The Blue Lake is partially formed by volcanic lava, and the water temperature is about 37–39 °C. The lake water is rich in minerals such as silicon and sulfur. Soaking in hot springs at Blue Lagoon can help treat some skin diseases, such as psoriasis.