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Kushiro Shitsugen NP, Hokkaido
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Red-crowned cranes are sometimes visible from Hosooka. After the species was thought extinct in Japan, a small group was found in 1924 at Kirakotan Cape, elsewhere in this same marsh—not at the observatory.
About 6,000 years ago, the land below Hosooka was under the sea. As the water retreated, it left lakes such as Takkobu, Toro and Shirarutoro; nearby capes still preserve the shape of that old coast.
In 2016, after 4 typhoons struck eastern Hokkaido in August, flooding closed the road to Hosooka. From the viewpoint, water spread across the marsh and pools appeared until the main river was hard to pick out.
The dark alder belts below Hosooka are clues to changing ground: they grow along riverbanks built up by sediment and in drier parts of the marsh. The forested patches help reveal where the wetland is shifting.
The paths around Hosooka pass traces of older lives, too. A local field guide notes pit-dwelling remains along the trails; in 2006, an eco-walk in the area also visited Jōmon-era dwellings and shell mounds.
In early spring, the Kushiro River can spill into the wetland, leaving shallow water among the reeds. Hokkaido’s nature guide notes that swans sometimes swim across these flooded areas visible from Hosooka.
Ainu language archives record crane names including saroruncir, meaning “reed-marsh bird,” and sarorunkamuy. The names point to the habitat of the cranes that visitors may occasionally spot from Hosooka.
Near Kushiro-Shitsugen Station, spring water seeps from the wooded slopes and gathers into small streams that flow into the wetland and the Kushiro River—a hidden water journey near Hosooka’s sweeping view.
Hosooka is also called Daikanbo, or “Grand Vista.” There’s no need for a tall tower: the lookout sits on higher ground at the edge of the marsh, whose remarkably flat expanse lets the winding river stand out.
Hosooka’s sunset has a calendar: Hokkaido’s nature guide singles out March and April. From the marsh’s eastern edge, the view opens west across the meandering river toward the evening light.
