Korsträsk is a locality in Älvsbyn Municipality, in Norrbotten County, Sweden. Korsträsk lies at 92 m above sea level. It has 327 inhabitants (2023). The nearest city is Piteå, 48 km to the southeast. Among the landmarks around are Boden Fortress (39 km), Älvsby Church (6.6 km) and Sikfors gamla kraftstation (22 km).
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