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Gua Kelam Niah National Parkis inhabited by flying lizards, long-tailed macaques and hornbills; this park is also known for its caves, primarily:

The Painted Cave
Features thousand-year-old iron-age cave paintings.

Great Cave
In 1873, Palaeolithic and Neolithic tools as well as human remains were found here. The Chinese delicacy, bird's nest is harvested in this cave while the Penan people collect guano here.

Apart from caves, visitors can trek or climb a 1,312.3 feet high limestone ridge. Facilities here include chalets, a hostel, rest house and canteen.

Getting there: Located 62.12 miles south of Miri, near Bintulu. It is best to book a trip with a tour operator.