Jachthaven De Rietpol sits on a small island in the village of Spaarndam, beside the Grote Sluis on the Spaarne river. Arriving from the Noordzeekanaal, boaters find the harbour immediately adjacent to the Kolksluis, reputed to be the oldest lock in Europe.

The marina offers around 100 berths plus 25 visitor places, with jetty and shore moorings, electricity and water connections, and a shipyard ramp rated for vessels up to 40 tons. From here it is a straightforward sail to the Buiten Spaarne and Haarlem.

The site is currently in transition: De Rietpol has been acquired by developer Spaarnedock, which is redeveloping the island — beginning with a redesigned marina — toward a future mixed-use project called Spaarnedock.

Local residents and a neighbourhood working group are actively involved in shaping the plans.