Portstewart Harbour sits on the North Antrim coast near where the Lower Bann meets the Atlantic Ocean.

It serves as an access point on the North Coast Sea Kayak Trail, with grid reference C815 385, and is associated with the North Coast Watersports Centre, whose facilities are available to paddlers by prior arrangement.

The harbour lies close to Portstewart Strand and provides a convenient launch or landing point for sea kayakers exploring this stretch of coastline between Castlerock to the west and Portrush to the east.