The Blue Lagoon is a man-made geothermal spa in southwestern Iceland, located near the fishing town of Grindavík. The water, which comes from the nearby Svartsengi geothermal power station, gets its milky blue shade from its high silica content. Just 12 miles (20 km) from Keflavík International Airport, the Blue Lagoon is a frequent pre- or post-flight pit stop for travelers and is one of the most visited attractions in Iceland.