Lopphavet is a stretch of open sea along the border of Troms and Finnmark counties in Norway.

It has a width of about 70 kilometres (43 mi), and it stretches between the large island of Sørøya in Finnmark and the islands of Arnøya and Nord-Fugløya in Troms.

The Sørøysundet strait and the Altafjorden connect to the Lopphavet on the east side of the sea.

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