Tham Kong Lo, also known as Kong Lor Cave, is a cave located in the Phu Hin Bun National Park in Khammouane Province, Laos. It is a karst cave system that stretches over 7.5 km and features a natural tunnel-like formation that was formed by the Hinboun River that flows through it.

The cave is known for its unique geological formations such as stalactites and stalagmites, and is also home to a variety of flora and fauna, including bats and fish. The cave is popular among tourists who can take boat tours through the cave system, which can take around 2 hours to complete.

The surrounding area is also popular for outdoor activities such as hiking, biking, and kayaking, and there are several small villages nearby that offer homestay opportunities for tourists. The Tham Kong Lo cave system is an important part of the local economy, and efforts are being made to protect it and its surrounding area through sustainable tourism practices.