Hakone Yumoto Onsen is the oldest hot spring among the Hakone Twenty Springs, with its opening dating back to the Nara period. Approximately 8,000 tons of hot spring water is discharged every day, and it is gentle on the skin due to its simple alkaline composition. There are many facilities where you can enjoy day trips to the hot springs, allowing you to relax and soak in the hot springs while enjoying the nature of Hakone. "Yuyujo Hakone no Yu" is popular for allowing pets to enjoy the hot springs, with an outdoor bath exclusively for dogs. Soaking in the hot springs with your beloved pet will provide even more healing! Of course, the outdoor bath for dogs is also a self-sourced hot spring.