De Oude Horn is an access point on the Linge river near Leerdam, in the area between the rivers Lek and Linge. The site is home to Watersportvereniging De Oude Horn, a marina made up of three sections: a bowl, an old harbor, and outer jetties along the Linge.

Visiting boaters are welcome, and the harbor masters work to provide safe moorings during the summer season. The marina is conveniently close to Leerdam's city center, with shops and supermarkets nearby.

The broader De Oude Horn site also features a historic steam pumping station, now repurposed as a glassworks studio. It serves as a landmark on several walking routes through the Lingegebied, including an easy 4.

5-mile loop that follows the river landscape from Leerdam.