Though there are no actively erupting volcanoes on Taiwan, evidence of the geothermal activity lurking just below the surface abounds. This takes the form of natural hot springs, with some developed into commercial attractions, but even more still wild, quietly awaiting those who are prepared to make the journey on foot. Further evidence comes in the form of a geyser, erupting regularly with geothermally heated water. All of these can be enjoyed as part of a cross-island journey from Taoyuan to Yilan on the Northern Cross-Island Highway (北橫公路).
The Northern Cross-Island Highway was completed in the 1960s, partially following a