The island location was specially selected for the outdoor activities, which use the local rainforests, cliffs of granite quarries. Mangrove swamps, surrounding seas and offshore islands. Outward Bound Singapore is one of the best equipped centers in the world,, having 66000 square meters of well-designed center buildings, a large swimming/training pool in the tropical jungle, a gymnasium, an Indiana multi-element challenge and commitment course, the tripod and summit course, the inverse tower challenge course, the Ubin rescue system. Numerous rock climbing walls, cutters , and many other facilities, including one of the largest zip wires in Asia. A vast majority of young Singaporeans will visit the island at some stage in their early lives and stay over in jungle accommodation blocks or in tents and carry out expedition, treks, and many personal adventure challenge courses.