These two huge, adjacent wildlife sanctuaries, covering 2,400 sq miles (6,220 sq km) and surrounded by a further 2,320 sq miles (6,000 sq km) of protected forest, form one of the most important conservation areas in Southeast Asia. They are listed jointly as a UNESCO World Heritage Site and are home to some of Thailand’s largest remaining wild elephant herds, as well as several endangered carnivores, such as tigers, clouded leopards, and Malaysian sun bears. The enormous gaur, a species of wild cattle, and the country’s last wild buffalo herds also live within the sanctuary. Rare species of gibbon can also be seen. At Huai Kha Khaeng there is a nature trail, but neither wildlife sanctuary is geared up for large numbers of visitors – permission for large parties to enter the parks can be obtained from Bangkok Forestry Department.