Established in 1981, Kaeng Krachan National Park contains 2,915-square kilometres of mostly old-growth forest stretching along the eastern slope of the Tenassarim Mountain Range, only 170 kilometres southwest of Bangkok. Leopards, elephants and rare birds roam the mist-shrouded mountains of Kaeng Krachan National Park. Few if any of the kingdom’s natural destinations match this one for jungle and wildlife, but it does take some effort to explore.