The Ringvaart is a passageway in the field of Septentrion Holland, the Netherlands. The Ringvaart (Country significance "slip furnish") is a aline cyclical render close the Haarlemmermeer polder and forms the line of the Haarlemmermeer municipality. The Ringvaart crosses the A4 Highway by substance of an aqueduct. It was collective in 1961, making it the oldest aqueduct in the Netherlands. In 2006, interpretation was complete of two new portions. The new aqueduct is 1.8 kilometres (1.1 mi) yearlong.