The Pa Sak Jolasid Dam or Pa Sak Cholasit Dam impounds the Pa Sak River at Ban Kaeng Suea Ten, Tambon Nong Bua, Phatthana Nikhom District, Lopburi Province, Thailand. It is the biggest reservoir in central Thailand.


asak Jolasid Dam is situated at Ban Kaeng Suea Ten, Nong Bua Sub District , Lopburi Province. It is around 120 kilometers from Bangkok. You can easily do a day trip or ride a special train trip (Bangkok- Pasak Jolasid Dam Route) on Saturdays, Sundays and Public Holidays which is  another  fun and exciting trip. Especially  when the train reaches the floating railway across the dam. You can clearly see where the water meets with the sky and the mountain range. Looking from afar, it seems like the train is wonderfully floating above the water. This special train is also drop off by the boundlessly yellow sunflower field so you can take selfies at  your leisure

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.

We can admire the beautiful scenery of the desolated river with the mountain range as the far away background by  sightseeing in a tram along the dam ridge or going up the tower of the multipurpose building to see the 360-degree  view. Thengo down to feed the fish before entering Chalermprakiat Tower to tour the Pasak Basin Museum which exhibits and reproduces the lifestyle of Thai Bueng tribe who has lived in  Pasak Basin area since the ancient  time, and also various  native plants. The Pasak Aquarium, which was completely built in B.E.2554, exhibits important species of freshwater fish in Pasak and Chao Phraya Basin including rare species such as Himantura Kittipong. You can also drop by to pay respect to the Phra Buddha Ratana Manee Maha Bophit Jolasid Mongkhon Chai (Luang Phu Pasak Yai) at the end of the dam. Before going back home, you can buy souvenirs at the famous Otop shops such as Sunflower seed products, honey and Din So Pong salted eggs  etc.

Being a beautiful tourist attraction is the by-product of the construction of this dam. In fact Pasak Jolasid Dam was built under the initiative of His Majesty the King who felt pity for the troubles of people who suffered every year from drought and floods. The king graciously granted this initiative on February 19, 1989 and had assigned the Royal Irrigation Department to urgently study the suitability of the Pasak River Basin Royal Development Project in order to solve the problem of regular drought and floods in Pasak Basin which also have continuous effect on Bangkok Metropolitan Region. On the occasion of  H.M.
the King’s Birthday on December,4,1993,the
King had said that insufficient water supply problem in Bangkok will be eradicated  by the 2 reservoir projects at Pasak River and Nakhonnayok River which will collect enough water for consumption and use in Bangkok Metropolitan Region. The king presided the royal grand opening of the dam on November 25, 1999 together with the queen and the HRH Princess Maha Chakri Sirindhorn  .

Pasak Jolasid Dam is also a large fish breeding center and freshwater fisheries center. It is the water resource for the consumption of the communities and for the agriculture in the new birth irrigation area in Lopburi Province and Saraburi Province. It also provide flood protection along the bank of Pasak River in Lopburi and Saraburi Province.

In order to perfectly enjoy this trip, don’t miss to stop by at the Pattana Nikom District Sunflower Field and the  Khao Jeen Lae Sunflower Field by using the Highway No. 3017 ( Sunflowers are in full bloom during November  – February ). And if you have 4wd car, you could drive up to see the views on the Phaya Duan Tong Hill which is about 10 kilometers from the dam.

By car using the Bangkok-Saraburi-Petchabun Route.

By  a public small bus service Wang Muang-Pasak Dam Route at the Victory Monument.

By train (for more information and reservations please contact directly at the train station or at Hotline No.1690.