Queen Marys Peak is the summit of the island of Tristan da Cunha, in the South Atlantic Ocean. It has an elevation of 2,062 metres (6,765 ft) above sea level. It is the highest point of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha.
The mountain is the peak of the massive shield volcano which forms the island. A 300 m (1,000 ft) wide summit crater caps the peak, and it contains a heart-shaped crater lake. This lake is normally frozen during the winter, and the upper slopes of the volcano are covered in snow.