Watersportvereniging De Oude Horn is a marina and water sports club situated on the Linge in Leerdam, founded in 1965 with the aim of promoting water sports in the area.

The marina is made up of three sections: a basin, an old harbor, and outer jetties along the Linge. It lies within easy walking distance of Leerdam's city center, with shops and supermarkets close by, while also sitting amid open natural surroundings.

The club has around 300 members and accommodates both permanent berth holders and visiting boaters. From here, the Linge and the Waal are reachable within about an hour.

The Linge itself is noted as the longest river in the Netherlands, offering extensive cruising opportunities along its banks and through the picturesque villages of the region.