Boiling Lake is situated in the Morne Trois Pitons National Park. It is a flooded fumarole 10.5 km east of Roseau, Dominica. It is filled with bubbling greyish-blue water that is usually enveloped in a cloud of vapour. The lake is approximately 200 feetto 250 feet across. The air around the area is hot, steamy and moist, supported by the sharp, acrid smell of sulphur.