Cold, clear freshwater, underwater gardens and a compact hot-spring base.
Overview
Lake Shikotsu offers guided freshwater scuba and river snorkeling beside a forested volcanic lake. Base yourself at Shikotsu Kohan for the water activities, visitor center and waterfront, or use Chitose as the transport gateway. The city's diving listing and national-park snorkeling listing establish real local activities.
June to September is the most practical combined-activity window, a planning judgment based on local climate and published operating seasons. Autumn and winter need different arrangements. Ordinary scuba, specialist ice diving and conservation cleanup trips are separate products. OCEAN DAYS introductory scuba is suspended for 2026; a dedicated current freediving service was not verified.
This is a land-based trip. Choose an accepted operator, confirm your language and equipment needs, and leave enough time for weather changes and the return journey.
Lake and outlet-river experiences provide an alternative to coastal diving. .
Quick shortlist before you jump into the full planning page.
Top species linked to approved dive spots in Lake Shikotsu.
The river-snorkeling product has national-park corroboration, with an identifiable local provider.
Pair the Yamasen Railway Bridge waterfront with village sightseeing and a separately checked bath visit.
The visitor center's access guide connects the lake to Chitose and New Chitose Airport without a ferry or overnight vessel.
1 linked spots
