The Blue Lagoon is a geothermal spa in Iceland that is situated in a lava field near Grindavik, on the Reykjanes Peninsula. The Blue Lagoon's warm and mineral-rich waters are said to have therapeutic and healing properties, making it one of Iceland's most popular tourist destinations.

The Blue Lagoon's milky blue-green water is heated by the nearby geothermal power plant, Reykjavik Energy, and is filled with silica, algae, and minerals such as sulfur and silica that are believed to be beneficial for the skin. Visitors can swim, soak, and relax in the warm waters and enjoy the stunning surroundings, which include a nearby lava field, towering cliffs, and steam rising from the water's surface.

The Blue Lagoon also offers a range of spa treatments and services, including massages, face masks, and in-water silica mud treatments. Visitors can also enjoy a meal at the on-site restaurant, which serves up traditional Icelandic dishes and offers stunning views of the surrounding landscape.