Scenic Landscape of Song Long Cave (Khuon Ha) is a beautiful and quite large-scale cave in the region, This is a beautiful and large cave. It takes about 3 hours by canoe on Tuyen Quang hydroelectric lake to reach the scenic Song Long cave in Khuon Ha commune. This is a beautiful cave, quite large scale. Song Long cave is over 200m above the water surface of the hydroelectric lake, the cave is about 40m high, about 50m wide, over 200m deep, in the cave there are many stalactite columns with interesting shapes, sparkling colors like diamonds. The cave is divided into many successive compartments, very attractive.