Ruiyan Hot Spring (中文版：瑞岩溫泉) is a riverside hot spring in Nantou, Renai Township. The water is very hot, and comes out from under the rocks at several locations along the river bank. Ruiyan Hot Spring is in a very quiet and secluded area, and getting to the hot spring is easy. It's a only 5 minute walk from the parking area, but if you drive a very low car I recommend you park up at the bridge instead, and walk for an extra 10 minutes along the dirt road.
Ruiyan Hot Spring
Nantou County, Renai Township
Hot Spring: 24.13517, 121.16994
Parking: 24.13485, 121.17033
Detailed Map: https://goo.gl/83x9HO