Nam Nao National Park
Lonely Planet review
One of Thailand’s most beautiful and valuable nature preserves, Nam Nao National Park covers nearly 1000 sq km at an average elevation of 800m, across the border of Chaiyaphum and Phetchabun Provinces, just beyond Khon Kaen Province. Although it covers remote territory Hwy 12 makes access easy. Temperatures are fairly cool year-round, especially nights and mornings, and frost occasionally occurs in December and January.