One of the biggest caves in the world is Mulu Caves and it is in Sarawak. It took about 60 million of years and harsh condition of weathers for the formation of Mulu Caves. Once Mulu Caves was inside the sea and the relentless process of weathering by the elements of rain, sun and time now began to shape the landscape we see today. Limestone pinnacles and bleached white is the identity of Mulu Cave with big chambers for the passage of wind.

Batu Caves is a limestone hill, which has a series of caves and cave temples, located in Gombak district, 13 km north of Kuala Lumpur, Malaysia. It takes its name from the Sungai Batu or Batu River, which flows past the hill. Batu Caves is also the name of the nearby village.