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In Japan, you’d be hard-pressed to find a city or town that doesn’t have at least one onsen (温泉). Thanks to abundant geothermal activity on the archipelago, there are thousands of these natural hot springs scattered throughout each of the prefectures. Not to be confused with bathhouses, or sentō, in which heated tap water is used, onsen must contain at least one of 19 specified minerals and have a natural temperature higher than 25 ?C (77 ?F) to be officially designated as such. For hundreds of years, people have enjoyed soaking in their healing waters to relax, unwind, and cure stress-related ailments.

Onsen don’t only differ in their mineral content; there are outdoor and indoor baths, public and private baths, and baths for mixed and gender-separate bathing. A popular way to enjoy different kinds of baths is to visit an onsen resort, a hot spring area or town with its own hotels, restaurants, souvenir shops and amusement facilities.

One of Japan’s top onsen resorts is located in Oita prefecture, which also boasts the highest number of hot spring locations and the highest annual yield of hot spring water in the country. Yufuin (由布院) is located just a 35 min drive from its popular neighbour Beppu, in a small valley beneath the impressive Mount Yufu. ...... (follow the instructions below for accessing the rest of this article).