With its misty lush rainforests, rocky peaks, mangrove-studded shores, raging rivers and coral reefs, Borneo is beautiful beyond imagination The third largest island in the world, Borneo is home to around 15,000 species of flowering plants. Also called the 'Island in the Clouds', Borneo boasts many endemic forest species like the Asian elephant, Sumatran rhino and the Clouded leopard. The island's rainforest is also home to the Bornean orang-utan.