Beppu's claim to fame is its incredible hot springs, or onsens. The town boasts eight distinct geothermal areas, so plentiful they've even earned the nickname "hells of Beppu," alongside countless other hot spring sources.

Beppu isn't just famous for hot springs, it's an onsen paradise. Onsen, unlike sento (public baths with heated tap water), are natural hot springs heated by the earth itself. This creates a unique experience with water that can vary in texture, smell, and the warmth it leaves on your body. The minerals in onsen water are what truly set them apart, offering a variety of therapeutic benefits.

In Japan, there are strict guidelines for calling a hot spring an "onsen." The water must not only be naturally heated to over 25°C, but also contain a specific level of minerals. With over 27,000 hot springs across Japan, fueled by the country's volcanic activity, there are ten distinct onsen water types to discover.

Beppu, however, reigns supreme. It boasts the world's highest volume of usable hot spring water, with many sources exceeding 42°C. This small town packs a punch with a staggering 2,300 onsen sources, making it the undisputed king of Japanese hot springs.

Absolutely, Beppu is a must-visit! Beyond the sheer number of onsens, Beppu boasts natural wonders like steaming vents nicknamed "hells" - a sight you won't find anywhere else.

If you're short on time, a day trip to Beppu lets you experience a few of the many hot springs and soak up the atmosphere. If you want to explore Beppu's "hells" (geothermal vents), museums, or nearby Mount Tsurumi, plan for 2-3 days to ensure a relaxed and fulfilling visit.

In an onsen, nudity is the norm. This might seem surprising at first, but there's a good reason for it: hygiene. Since everyone showers thoroughly before entering the hot spring water, wearing any kind of clothing, even clean swimwear, would actually contaminate the water. Swimsuit material traps dirt and sweat, which can then be released into the shared bathing pool.