温泉マップ is a free iPhone application developed by Yuji Asano. It falls under the Travel & Navigation category and provides users with a comprehensive map of hot springs across Japan. With this app, users can easily search for day trip hot springs in various prefectures.

The app offers a user-friendly interface, allowing users to navigate through a map of Japan and access hot spring information for each prefecture. Users can view hot spring locations on the map and access a list view for easier browsing. Each hot spring has a detailed page that provides information such as address, phone number, and user reviews.

Whether you're a local resident or a tourist visiting Japan, 温泉マップ is a valuable tool for finding and exploring hot springs throughout the country. Download this app now and embark on a relaxing and rejuvenating hot spring adventure in Japan.