Hvalfjörður, (“Whale fjord”) the longest fjord in the southwest of Ice­land, about 30 km long and up to 84 m deep.

Formerly a good harbour, and during the Second World War a big naval base run by the Allied Forc­es, where convoys often used to gather.

In 1402 the plague was brought to Hvalfjörður and from there it spread around the island.