Pa Sak Jolasid Dam is located in Nong Bua Subdistrict, Phatthana Nikhom District, Lopburi Province. It is the longest earthen dam in Thailand, constructed under the royal initiative of King Rama IX to prevent flooding. It spans two provinces, Lopburi and Saraburi, and serves as an important tourist attraction in Lopburi. Visitors can enjoy several attractions such as the Pasak Jolasid Dam Railway Station, the multipurpose building by the reservoir where they can release fish and enjoy the view, and the Pasak Jolasid Dam Tower and Museum. Additionally, there is a tram service for sightseeing along the 9,720-meter-long dam crest.