Pulau Tiga Island encompasses 158 square kilometers of open ocean containing three islands that were formed by mud volcano eruptions in the late 19th century. The Park consists of 3 islands, namely, Pulau Tiga (Survivor Island) being the main island, Pulau Kalampunian Besar (Sand Pit Island) and Pulau Kalampunian Damit (Snake Island).
The main island, Pulau Tiga is the biggest island of Pulau Tiga Park. It is formed by eruption of several mud volcanoes hundred year ago. Pulau Tiga is relatively flat, with the highest point reaching 100 meters only. You only need 6 hours to walk one round of the island.
A geology feature not found in other Sabah islands is the Mud Volcano. There are 3 mud volcanoes on Pulau Tiga. A visit to Pulau Tiga is incomplete without getting yourselves soaked and covered in mud. Some says the mud possesses medicinal and therapeutic properties which are good for the skin, but most get dirty just to have fun.
Pulau Tiga is a national park, so nobody is allowed to cut any tree. Most of Pulau Tiga is densely forested. Pulau Tiga is one of the favorites, due to its undisturbed lush forest and rich flora. Most Sabah islands have beach but no forest, like Pulau Tiga.