Morne Diablotin is the highest mountain in Dominica, an island-nation in the Caribbean Lesser Antilles. It is the second highest mountain in the Lesser Antilles, after La Grande Soufrière in Guadeloupe. Morne Diablotin is located in the northern interior of the island, about 24 kilometres (15 mi) north of Dominica's capital Roseau and about 10 kilometres (6.2 mi) southeast of Portsmouth, the island's second-largest town. It is located within Morne Diablotin National Park.