Green Lagoon - Yaiza, Lanzarote

This bright green lagoon is located on an ancient volcano and sits among black volcanic terrain. It reportedly was caused by ocean water being trapped in the crater from a nearby black sand beach beneath the volcano. The water turned green due to a mixture of algae and sulfur in the water. Swimming is not allowed due to it being a protected area and you probably wouldn’t want to anyway. The lagoon is close to the Timanfaya National Park.