Hammerslag is a small campground located near Westergeest in the Dutch province of Friesland, situated on the Aldswemmer.

The site covers just one hectare and offers 21 touring pitches ranging from 100 to 120 square metres, along with four rental accommodation units. The campground is open from late March through early November.

Facilities include showers with hot water, toilets, a washing machine, and an electric vehicle charging station on the property. Dogs are not permitted due to the risk of neospora infection.

Baby equipment such as a crib, baby bath, and high chair is available on request when booked in advance.