and to engage in rafting. Rapids along the river include the Wang Nam Yen Rapids within Thung Salaeng Luang National Park. Some portions of the Wang Thong River are designated level 5 rafting sites. This level of whitewater is the uppermost limit to rafting, meaning the river is wild, with a rapid current and difficult, steep rapids. The level of difficulty of the current depends on the volume of water flow. In the rainy season, the river becomes swifter. In June 2005, Phitsanulok Province initiated a campaign entitled "Sip Coffee at Kaeng Song, Paddle Along Nam Khek Rapids," and held the first Khek River Rafting Festival. The next Khek River Rafting Festival was held from July 7 through the end of October 2006 and the next from July 1 through October 31, 2007, under the name "Kaeng Song Cafe - Khek river rafting festival." Waterfalls Kaeng Song Waterfall Kaeng Sopha Waterfall Sri Dit Waterfall Wang Nok Aen Waterfall Bueng Rachanok Bueng Rachanok (Thai: บึงราชนก) is a swamp along the Wang Thong River within the Wang Thong District of Phitsanulok Province. The swamp was renovated in 1994 by Phitsanulok Provincial Administration Organization, and is now a popular tourist attraction. Hydroelectric power A study has been done at Naresuan University, Faculty of Engineering, to consider the practicalities of using the river's drop within the Salaeng Luang National Park to generate hydroelectric power. Wildlife Kaeng Bang Rachan at the source of the Wang Thong is a natural habitat for the freshwater jellyfish (Craspedacusta sowerbii) which is presently found in only the United States, Russia, the United Kingdom, Japan and Thailand. Also, it is a natural habitat for rare species of butterflies such as kaiser, Troides helena and Euploea. Royal visit King Rama IX visited the Wang Thong River to inspect the Khek River Basin Development Project at Lom Sak District of Phetchabun Province on 24 February 1981. The purpose of the inspection was in relation to the king's multi-purpose irrigation projects. References External links Malacological survey at Nam Khek River, Phitsanulok Province, North of Thailand Rivers of Thailand Nan River