Nakhon Nayok is a small province in central Thailand, northeast of Bangkok. In the east are the mountains, forest and grassland of the vast Khao Yai National Park, home to diverse wildlife including bears, elephants, macaques and rare birds. The park’s waterfalls, including the 9-tier Namtok Sarika waterfall with its natural pools, and the high Haew Narok waterfall, gush during the rainy season.