When you reach the cave entrance you are left in no doubt that you are about to enter the largest cave passage in the world. Deer Cave is simply huge – it is just over 2 kilometers in length and never less than 90metres high and wide. The main chamber, which is partially lit by sunlight, is 174 meters wide and 122 meters high. This is the area where deer used to shelter so the local Penan and Berawan people named the Gua Payau or Gua Rusa(Deer Cave). A path leads into the cave and winds its way around, following the natural contours of the cave floor. Although the path is lit, a flashlight is useful for examining the guano-covered cave floor and its population of insects. The path eventually leads to the “Garden I Eden” where a hole in the cave roof lets in a shaft of light which allows the rich green vegetation to thrive. Another feature is the famous profile of Abraham Lincoln, which guards the southern entrance of the cave..