Höfðavatn () is a lagoon-like lake in northern Iceland. It is located in the municipality of Skagafjörður.
Geography Höfðavatn lies at the fjord of Skagafjörður about 7 km north of the village of Hofsós.
The surface of the Höfðavatn is about 10 km2; the maximum depth is 6.4 m, the middle depth 3.9 M. North of the lake lies the Málmeyjarsund , west of Þórðarhöfði .
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