Bali Barat National Park (A.K.A. Taman Nasional Bali Barat or West Bali National Park) covers 50,000 hectares on the western tip of the island. It also includes another 7,000 hectares of coral reef and coastal water. Over 200 species of plants are found in Bali Barat National Park.There is also a wide range of rare and unusual fauna. These range from the indigenous bateng cattle through to spiders as large as your hand. The spiders aren't poisonous, but the scorpions are, and will make a victim quite sick for about 24 hours. Black monkeys, squirrels, wild pigs, buffalo, macaques, leaf monkeys, green snakes, barking deer, sambar, Java deer, squirrels, iguanas, pythons; these are all located in Bali Barat National Park.

Also living here are over 300 species of bird and this is one of the few places where the Bali starling (also known as Rothschild's mynah) is found in the wild. This is the only surviving bird endemic to Bali and one of the world's most endangered bird species. Though it breeds readily in captivity, and is sold in cages, when it comes to its natural habitat the bird borders on extinction with perhaps 14 remaining. Attempts are being made to release captive birds, but this is proving difficult as poachers are re-capturing them as fast as they can be released.

There are several unspoiled coral reefs off Menjangan Island, which is just north of the park's mainland. Local dive shops organize scuba and snorkeling trips. There's a network of fairly flat trails around the park's edges. You can arrange guided treks at the park office in Cekik, 6 km (4 mi) west of the park entrance at Labuan Lalang. Permits are required for travel within the park.