Mount Carstensz or the Carstensz Pyramid sometimes called Puncak Jaya, is a mountain in the Sudirman Range, the western part of central highlands of Papua province, Indonesia. With altitude 4,884 metres above sea level, Mount Carstensz is the highest mountain in Indonesia, the highest on the island of New Guinea, the highest of Oceania (Australia).
Mount Carstensz is one of the more demanding climbs in one version of the Seven Summits. It is held to have the highest technical rating, though not the greatest physical demands of that list's ascents. The standard route is up the north face and along the summit ridge, which is all hard rock surface. Despite the large mine, the area is highly inaccessible to hikers and the general public, requiring a 100-km hike from the nearest town with an airport, Timika, to the base camp, which usually takes about four or five days each way.