March 2023 Update from The Map Room's expedition there: The landslide lake and waterfall no longer exist. The new Sanfensuo Hot Spring, along the riverside, is hot, big and wonderful! The old Sanfensuo Hot Spring (on the hillside) still exists, but it's a nasty mess and not really worth bothering with as long as the new one is there. OLDER INFO: Jianianduan (Bunun: Kanitovan) used to be the home of some Bunun people. But now no one inhabits there. Jianianduan Hot Spring has its name because it is located in Jianianduan. One way is 16km. The water is the most difficult from Sunhai Bridge(starting point) to the fork of Danda River and Junda River because the two rivers merge and bring abundant water. On the way to Jianianduan Hot Spring, you will pass Sanfensuo Hot Spring(23.74605,121.06948), whose hot spring source is on mountainside. Second half of the river tracing is in gorge and water is again strong. Proper wading technique is necessary. And some bouldering technique is also important. The hot spring is only available in dry seasons in Taiwan.