Trou aux Cerfs is a crater, 300m (984ft) in diameter. It was formed as a result of volcanic activity millions of years ago and is now choked with silt, water and a dense forest of vegetation. It is possible to scramble down the sides to the water level but caution is advised. There is plenty of parking and a kiosk to shelter walkers. There are spectacular views of the island: looking west the first majestic vista is Rempart Mountain which Mark Twain described as a "vest pocket Matterhorn". This is flanked to the right by the three peaks of Les Trois Mamelles, standing proud, as Mauritians say, like three breasts. To the north west the humps of Mont St Pierre are dwarfed by the bulk of the Corps de Garde. In the foreground sprawl of Curepipe and Phoenix and in the distance Port Louis. Discernible by the jumbled range of the Moka Mountains, is the isolated peak of the thumb-like Pouce and the tiny ball forming the head of Pieter Both. Other peaks rise and fall like papier mache replicas dumped on the landscape by a child.
source: Mauritius UK Connection