Thung Salaeng Luang National Park

Thung Salaeng Luang National Park is a national park located in the Phitsanulok and Phetchabun Provinces of Thailand. It encompasses substantial portions of Amphoe Wang Thong and Amphoe Lom Sak.

Thung Salaeng Luang National Park is home to the Kaeng Song Waterfall, (or Namtok Kaeng Sopha) which is a three-tiered waterfall of the Wang Thong River. Shaped like a stairway, Kaeng Sopha is the largest waterfall in Phitsanulok, and it has been dubbed the Niagara Falls of Thailand. The torrents are very strong in the rainy season. The vapor rising in the area creates a vast rain-like curtain. Kaeng Sopha is the subject of a June, 2007 postage stamp in Thailand in the Thailand Waterfall series.