Brug over de Ringvaart (Bridge over the circle canal) The Ringvaart is a canal in the province of North Holland, the Netherlands. The Ringvaart is a true circular canal surrounding the Haarlemmermeer polder (low-lying land that has been reclaimed and is protected by dikes especially in the Netherlands) and forms the boundary of the Haarlemmermeer municipality. For additional information about Haarlemmermeer (Haarlem’s Lake).