Iya Valley, Japan

Known as the Tibet of Japan, the remote Iya Valley is tucked away in the mountainous interior of Shikoku, the least visited of the country’s four main islands. Tourism to the region took a leap forward when it hosted the World Rafting Championship in 2017 — putting its turquoise Class Four rapids firmly on the adventure-travel map. New ziplines and hiking trails are sprouting up in the canyons, while upgrades have been made to accommodations in the area’s traditional thatched-roof farmhouses, or minkas. Chiiori House is the most luxurious; the property also maintains an excellent portfolio of more affordable options.