This is the country's largest national park which lies along the borders of Tanintharyi Nature Reserve of Burma. Made up mostly of verdant rainforests the sanctuary attracts many visitors who love spectacular sights of the dense morning mists through which tops of hills peek through; this phenomenon is most common during December and March. Kaeng Krachen is popular for its huge percentage of wildlife amongst which birds and butterflies are spotted in plenty. Also to be spotted are giant pitta, woolly necked storks, great Argus, leopards, wild dogs, elephants and bears.