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Lake Kussharo (屈斜路湖) is the largest caldera lake in Japan and the third-largest lake in the country overall, sitting at roughly 80 square kilometres within the Akan-Mashu National Park in eastern Hokkaido. It was formed by volcanic activity and the caldera walls rise steeply on several sides, giving the lake a remote, enclosed quality that sets it apart from most freshwater destinations in Japan.
The lake is perhaps best known outside Japan for two things: the hot spring water that seeps through the sandy beaches along its shore — a phenomenon rare enough that visitors can dig their own onsen pits in the sand — and the large population of whooper swans that overwinter here, drawn partly by the warmth of those same geothermal springs keeping sections of the water ice-free.
The surrounding landscape is sparsely populated. The small settlement of Teshikaga is the closest town of any size, and the lake shore is dotted with a handful of ryokan, campsites, and rest stops rather than resort infrastructure. This makes Kussharo rewarding for travellers who want genuine wilderness access, but it does require some planning around transport and accommodation.
Kussharo sits alongside Lake Mashu and Lake Akan as part of the Akan-Mashu National Park circuit, and most visitors combine all three in a single multi-day itinerary through the Kushiro-Teshikaga region.
Before You Go
Visas
Japan has a tiered visa policy that varies by passport nationality. For current entry requirements, check TravelerPulse's Visas section and the official Japan Immigration Services Agency website. Do not rely on secondhand summaries, as rules can change.
When to visit
- Winter (late January–February): Peak season for whooper swan viewing at Sunayu and Wakoto Peninsula. Temperatures regularly drop well below freezing; pack serious cold-weather gear.
- Spring (April–May): Snow lingers on the caldera rim; some facilities may still be closed. Road conditions should be verified locally.
- Summer (June–August): Warmest and most accessible season. Hiking, cycling, and canoeing are all viable. Wildflowers appear on surrounding hillsides.
- Autumn (late September–October): Foliage on the caldera walls turns vivid orange and red. Cooler temperatures and thinner crowds.
What to pack
Winter visitors should bring thermal base layers, waterproof outer shells, and grip footwear for icy paths. In any season, a rain layer is advisable given Hokkaido's changeable weather. Insect repellent is useful near the lakeshore in summer.
Connectivity and cash
Mobile data coverage can be patchy on the lake's more remote shores. Download offline maps before you arrive. Many smaller establishments around the lake are cash-only; carry yen from Teshikaga or Kushiro.
Getting There
By air
The most practical entry point is Kushiro Airport (KUH), which receives domestic flights from Tokyo (Haneda) and other Japanese cities. From the airport, access to Lake Kussharo requires onward ground travel. Verify current flight schedules and operators directly, as regional routes can change seasonally.
By rail
The JR Senmo Line runs from Kushiro through Mashu and Kawayu Onsen stations, which are the closest rail stops to the lake. Kawayu Onsen Station is a reasonable base for the eastern shore. Journey times and timetables should be confirmed on the JR Hokkaido website, as this line operates infrequently — some stretches have only a few trains per day.
By bus and car
Sightseeing buses (notably operated seasonally by Akan Bus) connect Kushiro, Mashu, Kawayu Onsen, and other points in the national park. Schedules are seasonal and limited; verify the current timetable with Akan Bus or through your accommodation before arrival.
Renting a car in Kushiro is the most flexible option and is strongly recommended for anyone wishing to explore multiple lake viewpoints and trailheads independently. Roads around the lake are generally well-maintained in summer but can be hazardous in winter without winter tyres, which rental companies in Hokkaido typically fit as standard during cold months — confirm this at booking.
Getting Around
The lake perimeter is approximately 57 kilometres, so cycling the full circuit is achievable for fit cyclists over a long day, but most visitors focus on specific points of interest. Rental bicycles are available at some accommodations and at Kawayu Onsen — verify availability locally, especially outside peak summer months.
A private car or rental vehicle gives the most practical access to viewpoints such as Bihoro Pass (Bihoro-toge), the Sunayu sand-beach hot spring area, Wakoto Peninsula, and the various lake overlooks along Route 243 and Route 391. Parking areas are generally available at major stops.
Taxis operate from Kawayu Onsen and Mashu stations but are limited in number; do not rely on hailing one roadside. Arrange in advance through your accommodation if needed.
Where to Stay
Accommodation around Lake Kussharo is limited and largely concentrated in two areas: the Kawayu Onsen hot-spring village on the lake's eastern edge, and small lakeside ryokan and campsites dotted around the shore. Kawayu Onsen has the greatest concentration of ryokan and hotels offering onsen baths, and staying there makes it straightforward to visit the lake without a car for at least some activities.
Lakeside properties tend to be smaller and more rustic, often combining camping infrastructure with simple indoor lodging. These are popular in summer and can book out; reserve well in advance for July and August, and also for the February swan-viewing peak.
Teshikaga town, around 20 kilometres away, has additional practical accommodation and convenience stores if the lake-area options are full. Kushiro city, roughly 90 kilometres to the southwest, functions as the main regional hub and has a full range of hotel categories.
Always confirm current property operating status and dates before booking, as some smaller establishments close for portions of the off-season.
Things to See & Do
Whooper Swan Watching
From around December through March, whooper swans gather in numbers at Sunayu, near the lake's eastern shore, where geothermal water keeps that section from freezing. Early morning visits generally offer the best viewing. Binoculars are worth bringing. There is no admission charge to view the swans from the shoreline, but verify access conditions locally in winter.
Sand-Beach Hot Springs (Sunayu)
At the Sunayu area, hot spring water percolates through the sandy beach. Visitors can dig shallow pits and soak their feet or lower legs. This is an informal, outdoor experience — the temperature of the water varies by spot and season. Come prepared with a towel and be mindful of other visitors sharing the beach.
Wakoto Peninsula
A small volcanic peninsula that juts into the lake, Wakoto has a looped walking trail of around 2.5 kilometres through mixed forest. Wild deer are frequently seen. There is also a small outdoor foot-bath beside the lake. The peninsula is a campsite area in summer.
Bihoro Pass Viewpoint
Bihoro-toge sits at roughly 525 metres on the caldera rim and offers one of the most expansive views over the lake and surrounding forest. It is accessible by road and is particularly rewarding in autumn. A small rest stop and viewing platform are present — verify seasonal opening locally.
Hiking
Several trails access the caldera rim and surrounding peaks within the national park. Mount Mokoto and trails near Kawayu are among the established options. Trail conditions vary significantly by season; check with the national park visitor centre or local accommodation before setting out.
Food & Drink
The dining scene around Lake Kussharo is modest. Most ryokan include breakfast and dinner in their rates, and for many guests staying at a traditional inn, these meals — typically featuring locally sourced Hokkaido ingredients such as fresh dairy, seafood, venison, and vegetables — represent the primary dining experience.
Stand-alone restaurants are limited around the lake itself. Kawayu Onsen has a small number of restaurants and cafés within walking distance of the main lodging area. For a wider choice, Teshikaga or the roadside rest stops along national park routes offer ramen, set-meal teishoku, and light snacks.
Hokkaido is nationally recognised for dairy quality, and soft-serve ice cream made from local milk is a ubiquitous treat at roadside stops throughout the region, including those near the lake. Kushiro, as the nearest city, has a full restaurant selection and a morning market worth visiting if you are passing through.
Alcohol is widely available at convenience stores in Teshikaga and at ryokan. Be aware that convenience stores may be the only late-night option for food and drinks near the lake.
Practical Information
Emergency numbers
Japan's standard emergency numbers are 110 for police and 119 for fire and ambulance. These apply nationwide including Hokkaido.
Medical facilities
The nearest hospital services of any scale are in Teshikaga or Kushiro. For anything beyond very minor issues, plan to travel to Kushiro. Carry any prescription medications in adequate supply and with documentation.
Communications
Purchase or rent a Japanese SIM card or pocket Wi-Fi device at Kushiro Airport or in the city before heading to the lake. Coverage can be unreliable on the more remote stretches of the lakeshore.
National park rules
Lake Kussharo lies within Akan-Mashu National Park. Collecting plants, disturbing wildlife, and lighting fires outside designated areas are prohibited. Follow posted guidance at trailheads and viewpoints.
Accessibility
The Bihoro Pass viewpoint and some lakeside areas have paved access and parking, but many trails are uneven. Visitors with mobility considerations should verify conditions at specific sites locally before visiting.
Safety
Lake Kussharo is a low-crime area with no particular safety concerns beyond those typical of rural wilderness environments in Hokkaido. The primary risks are environmental.
In winter, ice and snow create genuine hazards on roads and paths. Even main roads can be treacherous; drive only with appropriate tyres and reduce speed significantly. Never walk on lake ice without local guidance — thickness varies, especially near geothermal vents.
In warmer months, brown bears (Ussuri brown bear, Ursus arctos lasiotus) are present in Hokkaido's wilderness areas. Before hiking, ask your accommodation or the national park visitor centre about current bear activity in the area. Carry a bear bell and follow posted advice at trailhead notices.
Volcanic gas is a consideration in some parts of Akan-Mashu National Park. Heed any warning signs or closures near volcanic features.
