Khao Yai, Nakhonratchasima, Thailand

Nakhon Ratchasima, 260 km from Bangkok, is the first Isan province on Highway 2 that rises over the hills that separate central Thailand from the northeastern plateau. With a population of 2.4 million, the province dominates Isan. The modern provincial town spreads out on all sides of the old rectangular moat, and the reconstructed city gates remain with the former centre, turned into a bustling market, while the rest of the new town is the commercial and business hub for the lower Northeast region. Khao Yai National Park is part of the mountain chain that divides the Northeast Plateau from the central plains and Cambodia to the southeast. Khao Yai, which means "Big Mountain", was established in 1962 as Thailand's first national park. The park has over 20 waterfalls, the most famous of which is the 25-metre-high Haeo Suwat. The park headquarters stands 40 km off a road running southeast from Highway 2, 165 km from Bangkok and approximately 100 km from Nakhon Ratchasima.