Khao Ruak Reservoir is located within Namtok Sam Lan National Park in Saraburi Province, a small reservoir surrounded by mountains and a lush bamboo tunnel that provides shade throughout the entrance. It is perfect for visitors seeking outdoor recreation, such as pedal boating, kayaking, or enjoying a peaceful lakeside picnic in a tranquil and private atmosphere. Additionally, the lakeside campsite is well-known for its comfort and comprehensive facilities, including a welfare shop and clean restrooms, making it a popular camping destination near Bangkok where guests can enjoy the refreshing breeze and easily hike to the nearby Sam Lan Waterfall just a few hundred meters away.