Kusatsu Onsen is one of Japan’s most famous hot spring towns, located in Gunma Prefecture, up in the mountains not too far from Tokyo. It’s known for its high-quality mineral-rich waters that have been used for health benefits for hundreds of years. One of the town’s main attractions is the "Yubatake," or "Hot Water Field," where the hot spring water cools down before being sent to the baths. It’s a popular spot to take photos and a symbol of Kusatsu.