The Morne Trois Pitons National Park in the island country of Dominica, in the Caribbean, is an area of significant volcanic activity. Located within the boundaries of the park’s nearly 7,000 hectares are five volcanoes, dozens of hot springs and fumaroles and a very large and famous boiling lake.

Dominica's Boiling Lake is actually a flooded fumarole, which is an opening or a hole in the Earth’s crust. It is filled with bubbling greyish-blue water at temperatures of around 90°C. The water is heated by hot steam and gases escaping from molten lava below. The surface of the lake is usually enveloped in a cloud of vapor. The lake is around 76 meters across, making it the second-largest hot lake in the world after the Frying Pan Lake in Waimangu Valley near Rotorua, New Zealand.

Photo credit: Antoine Hubert/Flickr