Pasak Jolasid Dam is the Thailand’s longest Homogeneous Earth Dam. With the length of 4,860 m. and the height of 36.5 m., it is the 13 rd largest dam from 25 dam of Thailand and the Pasak Basin occupies an area of around
14,520 square kilometers. The Pasak River source comes from Loei Province and runs past Petchabun Province, Lopburi Province, Saraburi Province before meeting with the Chao Phraya River in Ayutthaya Province. The Pasak River has an overall length of 513 kilometers.