Sai Sorn Reservoir, originally named Mosingto Reservoir, is situated at the heart of Khao Yai National Park, a globally recognized natural World Heritage Site. This reservoir was constructed in 1981 with the primary goal of establishing a crucial water source for consumption within the park boundaries and, more significantly, serving as a vital water source for the local wildlife. The reservoir was later renamed in honor of Mr. Boonruang Sai Sorn, the first chief of Khao Yai National Park.

The surrounding area boasts diverse and stunning scenery. The banks of the reservoir are characterized by a wide, open expanse covered with lush, well-maintained green slopes, creating an atmosphere reminiscent of meadows in Europe or other temperate regions, particularly during the cooler or rainy seasons. This open layout makes the area ideal for light recreational activities such as having a relaxing picnic, taking a leisurely stroll to enjoy the cool breeze, and soaking in the panoramic views of the mountains that embrace the water body.

Beyond its scenic beauty, Sai Sorn Reservoir is also an excellent location for wildlife observation within the park. Especially during the early morning hours before sunrise and the late evening hours before sunset, visitors have a high chance of spotting various animals, such as deer (both wild deer and sambar), coming down to drink and graze along the banks. This is a highly cherished experience for nature enthusiasts. Visiting during these golden hours is, therefore, extremely popular.

In terms of ecotourism, Sai Sorn Reservoir acts as a rest stop or starting point for some of the park's shorter nature trails (it is advisable to inform and consult with park rangers first). However, most visitors come here primarily for photography, focusing on highly recognizable compositions such as the solitary tree standing majestically by the water and the wooden walkway extending over the water. All these features contribute to Sai Sorn Reservoir being celebrated as one of the most beautiful and romantic sunset viewing spots in Khao Yai.

• Sai Sorn Reservoir is located within the Khao Yai National Park area. From the Khao Yai toll booth (Pak Chong side), drive along the park's main road for approximately 14 kilometers. The reservoir will be on the left-hand side. There is parking available on the opposite side.

• Visit in the morning and evening for the best light for photos.

• The windy conditions around the reservoir can be strong, so bring a jacket.

• Avoid heavy rain, as visibility may be reduced.

• Bring a mat if you want to sit by the water.

• Do not swim or disturb any wildlife you may encounter near this area.

Admission Fees:

• Thai: Adults 40 baht/person, children 20 baht/person

• Foreigners: Adults 400 baht/person, children 200 baht/person

If you bring a vehicle into the park, the fee is charged according to the type of vehicle as follows:

• Bicycles: 20 baht/person

• Motorcycles 30 baht/person

• Cars (no more than 4 wheels) 50 baht/person

Opening Hours:

• Open daily from 6:00 AM to 6:00 PM (these are the overall operating hours of all tourist attractions in the park).