As its name suggests, this area was a hidden and ancient place where has entrances spread in all locations of Crocodile Isle (except Gangplank Galleon and Flying Krock, because are vehicles). Ancient jungles contains spike traps with Kong skulls, which shows some Kongs visitors entered in Lost World and don't returned anymore; others areas this place includes a small volcano and frozen caverns. In the center of the lake contains the large volcano with Kremling's head sculpture pumps out an upward stream of energy which somehow powers Crocodile Isle.