Manza Onsen is a hot spring located in Gunma Prefecture, high up in the mountains of the Joshinetsu Kogen National Park, near the still-active Mount Shirane. The hot springs here are rich in sulfur, known for its skin benefits and medicinal properties. Being up in the mountains, Manza Onsen offers beautiful natural views, making it a perfect spot to relax in the hot springs surrounded by nature. In the winter, the area is also popular for skiing and snowboarding.