Lake Shikotsu Onsen (支笏湖温泉)

Lake Shikotsu Onsen: The “Shikotsu Blue” Sanctuary of Tranquility

Lake Shikotsu Onsen is a hidden gem located in the heart of the Shikotsu-Toya National Park, just 40 minutes from Hokkaido’s main gateway, New Chitose Airport. The lake is a prehistoric caldera, so deep (363 meters) and pure that it has been ranked as having the best water quality in Japan for over a decade. This purity creates a stunning optical phenomenon known as “Shikotsu Blue,” a deep, mesmerizing turquoise. Unlike the more bustling tourist hubs, Shikotsu Onsen is a tranquil settlement where buildings are designed to blend into the surrounding forest. It is a destination for those seeking silence, deep wilderness immersion, and “Beauty Waters” that leave the skin feeling like silk.

Key Information

The Healing Waters: The Science of “Liquid Soap”

The waters of Lake Shikotsu emerged in 1974 through boring into the deep volcanic bedrock. Scientifically classified as sodium bicarbonate springs, they are often referred to as “Liquid Soap.” The alkaline nature of the water emulsifies skin oils and dissolves dead keratin cells, leaving the skin incredibly smooth and bright. On the northern shore, the historic Marukoma Onsen features a unique “Natural Open-Air Bath” that is directly connected to the lake. The water level in the bath rises and falls naturally with the lake level, separated only by a wall of rocks. This creates a rare hydrological connection between the geothermal source and the caldera water, offering one of the most “pure” soaking experiences in Hokkaido.

Top 5 Recommended Ryokans

• Lake Shikotsu Tsuruga Resort Spa Mizu no Uta (Wellness Luxury): A high-concept resort focused on “Water and Health.” It features a healthy buffet, a pillow gallery, and exceptional spa facilities.
• Lake Shikotsu Tsuruga Bessou Ao no Za (Ultra-Exclusive): The pinnacle of luxury in the area. All rooms are over 100 square meters, featuring private open-air baths with direct views of the “Shikotsu Blue” waters.
• Marukoma Onsen Ryokan (Heritage/Nature): Founded in 1915, this is a secret getaway accessible by a winding lakeside road. Its historic natural baths are a must-visit for onsen purists.
• Shikotsuko Daiichi Hotel Suizantei (Traditional/Refined): An elegant Japanese inn known for its high-quality Kaiseki meals and private hinoki (cypress) tubs in many rooms.
• Kyukamura Shikotsuko (Family/Nature): Located on a hill surrounded by wild bird forests, this facility is perfect for families and budget travelers who love hiking and outdoor activities.

Must-Visit Public Baths (Soto-yu)

Lake Shikotsu is more of a quiet retreat than a public bath town, but Marukoma Onsen is the primary destination for day-trip bathers. For a small fee, non-guests can experience the legendary natural pools. In the town center, there are several Public Footbaths where hikers can rest their feet while looking out at the red Yamasemi Bridge. Kyukamura Shikotsuko also opens its mineral baths to day-visitors, providing a great post-hike soak for those climbing Mount Tarumae.

Walking Guide & Scenic Spots

The Shikotsuko Nature Path is a 2-kilometer trail perfect for birdwatching and seeing the diverse flora of the primeval forest. For the best photos, head to the Yamasemi Bridge (a bright red historic railway bridge) at dawn. For adventurous travelers, a hike up Mount Tarumae is essential; the summit offers a breathtaking view of the lake’s caldera and a steaming active lava dome. In winter, the Chitose-Lake Shikotsu Ice Festival transforms the lakeside into a glowing “Ice Museum” made of frozen lake water.

Local Gastronomy & Souvenirs

The absolute culinary star of the area is Himemasu (Kokanee Salmon). These fish live only in the crystal-clear waters of the lake and are prized for their delicate, sweet flavor. Try it as sashimi, grilled over charcoal, or in a “Himemasu Sushi” set. Another local treat is Venison Burgers sold at the town’s small cafes. For souvenirs, look for “Shikotsu Blue” glassware, local honey from the mountain forests, and “Marimo” themed goods from nearby Lake Akan.

Cultural & Historical Context

The lake was formed roughly 40,000 years ago during a massive eruption that shaped much of central Hokkaido. The name comes from the Ainu word shikot, meaning “large depression” or “valley.” Historically, the area was inaccessible and remained a pristine wilderness until the Meiji era. Today, the town is a leader in Sustainable Tourism. Marukoma Onsen, for example, was the first in Hokkaido to receive international ESG certifications for its commitment to preserving the natural beauty of the national park.

Practical Travel Tips

Transportation: The bus from New Chitose Airport is convenient, but check the schedule—it runs less frequently than Sapporo lines. Winter Travel: The road to Marukoma Onsen can be treacherous in snow; if you are not experienced with winter driving, use the hotel’s shuttle service. Overtourism: During the Ice Festival (February), the town becomes very crowded. Guests staying at local ryokans get “Premium Time” access to the festival grounds after the general public has left.

2025-2026 Latest Updates

The 2026 Chitose-Lake Shikotsu Ice Festival is confirmed to run from January 31 to February 23, 2026. This year, the festival will introduce a new “Ice Music Zone” with interactive sound installations. Additionally, the Shikotsu Lake Environmental Conservation Fee (a voluntary contribution) will be promoted more actively in 2026 to fund the protection of the lake’s water quality.

Safety & Manners

Always wash your body before entering the communal tubs. When using the natural baths at Marukoma, be aware that the rocks can be slippery and the water level can be quite deep depending on the season. Please do not feed the local foxes or deer, as this is a strictly protected National Park area. Finally, take all your trash back to your hotel to help maintain the “No. 1 water quality” status of the lake.