Kamata Onsen
Kamata Onsen is a nostalgic public bathhouse that has been in operation since 1937. The naturally sourced hot spring water that flows here is jet black - considered the darkest among Kamata’s many black-hot-spring baths. This distinctive color comes from humic acid, which is rich in marine minerals. Despite its appearance, the water has no unpleasant odor, making it approachable even for first-time visitors.
The space isn't very big, but it's super clean and has a really relaxing vibe. The price is very reasonable, too. This place is definitely a hidden gem in the neighborhood for hot springs.


