Loenen is a former municipality in the Netherlands, in the province of Utrecht. It was in the Vechtstreek area. On January 1, 2011, Loenen merged with Breukelen and Maarssen to form Stichtse Vecht. The earliest traceable mention of the game of golf refers to a game played in Loenen aan de Vecht. In his book Early Golf, Steven van Hengel describes how the game of "Colf" or "Kolf" was played in 1297 near the castle of Kronenburg. The players had to hit the castle door in as few strikes as possible from the Court House by hitting a ball with a stick.