The Blue Lagoon is a geothermal spa located in southwestern Iceland, known for its milky blue waters and therapeutic properties. The lagoon is situated in the middle of a lava field and is fed by naturally heated seawater, rich in minerals like silica and sulfur. Visitors can soak in the warm waters, which are said to have healing properties for skin conditions like psoriasis and eczema. The lagoon also offers a range of spa treatments, including massages and facials. The Blue Lagoon is one of Iceland's top tourist destinations and is often considered a must-visit spot for travelers to the country.