Consisting of roughly 1,100 square miles of untouched jungle, Kaeng Krachan is the largest national park in Thailand, as well as one of the premier destinations in the country for spotting rare Southeast Asian wildlife. The park rests along the Burmese border, combining with neighboring Tanintharyi National Park to provide a sprawling paradise of pristine rainforest that’s home to leopards, sun bears, elephants, jackals, and hundreds of other elusive indigenous species. While wildlife can be encountered in abundance within the park, there’s no shortage of natural sites either – Kaeng Krachan is full of lengthy hiking trails that lead to surging waterfalls, deep caves, and hundreds of tiny ponds.