The Piton des Neiges (Snow Peak) is a massive 3,069 m (10,069 ft) shield volcano on Réunion, one of the French volcanic islands in the Mascarene Archipelago in the southwestern Indian Ocean. It is located about east of Madagascar. Piton des Neiges is the highest point on Réunion and is considered to be the highest point in the Indian Ocean. The volcano was formed by the Réunion hotspot and emerged from the sea about two million years ago. Now deeply eroded, the volcano has been inactive for 20,000 years and is surrounded by three massive crater valleys, the Cirques. Piton des Neiges forms the northwestern two thirds of Réunion, with the very active Piton de la Fournaise comprising the rest. As its name suggests, snow is occasionally seen on its summit in winter. The volcanic island is considered to be about three million years old (Pliocene); the other two islands in the archipelago, Mauritius and Rodrigues, are 7.8 million (Miocene) and 1 million (Pleistocene) years old, respectively. The island possesses a high endemism of flowering plants (about 225); this has justified the creation of a biological reserve on the lower slopes of the Piton des Neiges. Tourism There are three medium-difficulty tracks leading up to the peak, one from the Cirque de Salazie, one from the Cirque de Cilaos and one from La Plaine des Cafres. They meet at a staffed mountain hut about an hour's walk below the peak at la Caverne Dufour. Walkers often arrive there after a long day trek up the mountain, and start out very early the next day to watch the sunrise from the summit. The hike can be done in a long one-day 10- to 12-hour hike, but it is often preferable to make it a two-day hike - many hikers like to get up early on the second day and make the (easy) remaining ascent with torches, so as to see the sunrise from the mountaintop. The mountain hut offers heated indoor lodging, outdoor tent lodging, and meals. It is best to make reservations. The hike starting from Cilaos is about 6.5 hours up and 4 hours down. To reach the start of the hike, drive through Cilaos toward la Mare à St Joseph. About 3 km (1.9 mi) past Cilaos, you will see a sign and some parking on both sides of the street. You may also leave your car downtown