Bako National Park, established in 1957, is the oldest national park in Sarawak, eastern Malaysia, on the island of Borneo. It covers an area of 27.27 square kilometres (10.53 sq mi) at the tip of the Muara Tebas peninsula at the mouth of the Bako and Kuching Rivers. It is approximately 40 kilometres (25 mi) by road from Kuching. Millions of years of erosion of the sandstone have created a coastline of steep cliffs, rocky headlands and stretches of white, sandy bays. Wave erosion at the base of the cliffs has carved many of the rocky headlands into fantastically shaped sea arches and seastacks with colored patterns formed by iron deposition. Some of these rock formations can be seen on entry to the Teluk Assam Beach, which fronts the park. The park can only be reached by a 20-minute boat ride from the village of Kampung Bako. It is often visited as a day-trip from Kuching, though accommodations (campground and forestry service bungalows) are available.
Gunung Mulu National Park is famous for its limestone karst formations. Features include enormous caves, vast cave networks, rock pinnacles, cliffs and gorges.
Gunung Mulu National Park has the largest known natural chamber or room - Sarawak Chamber, found in Gua Nasib Bagus. It is 2,300 feet (700 m) long, 1,300 feet (396 m) wide and at least 230 feet (70 m) high. It has been said that the chamber is so big that it could accommodate about 40 Boeing 747s, without overlapping their wings. The nearby Deer Cave was, for many years, considered the largest single cave passage in the world.