Vatnsnes () is a peninsula jutting into Húnaflói in northern Iceland. It is surrounded by waters of Miðfjörður on the west and Húnafjörður on the east. It is home to one of the largest seal colonies in Iceland, among others at HindisvÃÂk and ÃÂsar . Seals have been protected for many years in HindisvÃÂk. A stone hut was built at ÃÂsar on the eastern side of the peninsula for seal watching.
Among geological features of Vatnsnes are Borgarvirki, a volcanic plug mentioned for its use as a fortress in the Sagas of Icelanders, and HvÃÂtserkur, a 15 m high basalt rock formation near the eastern shore of the peninsula.