The Blue Pond (青い池, Aoiike) outside the hot spring town of Shirogane Onsen is named after is deep blue color which it owes to natural minerals dissolved in the water. Not promoted as a tourist spot until recent years, the pond is part of an erosion control system that was built to prevent damage to Biei in case of an eruption by nearby Mount Tokachidake.
Besides a parking lot, the pond has not seen much touristic development. It takes visitors 5-10 minutes to walk through the forest to the pond. Around the pond there is not much to do other than to enjoy the scenery, which also includes some concrete structures of the erosion control system.
The Blue Pond is located along Prefectural Road number 966, which connects central Biei with Tokachidake Onsen via Shirogane Onsen. A parking lot (500 yen per car) is located next to the road from where the pond can be reached in a 5-10 minute walk.
Buses between Biei Station and Shirogane Onsen stop at Shirogane Aoiike Iriguchi (白金青い池入口) bus stop along the way. The one way ride from Biei Station to the pond takes 20 minutes and costs 550 yen one way. There are only five round trips per day.