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Kushiro Shitsugen NP, Hokkaido
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Hosooka looks west across the wetland, so its sunset is no sea horizon: the sun sinks beyond a broad sweep of marsh, with the Kushiro River’s looping bends and the distant Hokuto hills completing the view.
Hokkaido’s prefectural guide singles out March–April for Hosooka’s striking sunsets. Early spring can also bring river water spilling across the marsh, where swans may swim—a lively sight beneath the evening sky.
In winter, Hosooka draws fewer visitors; Japan’s Environment Ministry notes that a lucky sunset can be enjoyed amid the marsh’s quiet. Look south and you can also see the Iwabokki water gate and Kushiro’s downstream townscape.
The sunset washes over land that was once seabed: about 4,000 years ago, after the sea retreated, this lowland became peat-rich wetland. Today, the Kushiro River winds across that ancient marine landscape.
