Alphense Kanovereniging "De Kromme Aar" is a paddling club founded in 1983 and based in Alphen aan den Rijn, named after the small river De Kromme Aar.

The clubhouse sits on Machineweg alongside the Aarkanaal, near the Zegerbrug, and serves as a practical water-access point for paddlers heading out in multiple directions.

From this location, paddlers can reach the Zegerplas, follow the Grote Wetering toward the Nieuwkoopse Plassen, or travel the Aarkanaal itself.

The club organizes regular touring trips on Dutch rivers, canals, and lakes, and hosts an annual canoe polo tournament drawing teams from across the Netherlands.

Disciplines practiced include touring kayak, canoe polo, slalom, sea kayaking, marathon, and whitewater paddling. The boathouse accommodates roughly 180 canoes and kayaks.