Camping Fort Buitensluis is a small, friendly campsite set within the historic grounds of Fort Buitensluis, located just south of Numansdorp on the north bank of the Hollandsch Diep in the province of South Holland.

The fort itself dates to 1793, originally constructed as an earthen fortification at the mouth of Numansdorp's harbor, positioned strategically opposite the fortified town of Willemstad.

Over the following centuries it was reinforced with stone buildings, powder magazines, and barracks, and later with reinforced concrete bunkers and cannon positions during World War I and II.

This layered military history gives the campsite a distinctive and atmospheric setting.