Dreiländergarten, Landscape garden in Weil am Rhein, Germany

Dreiländergarten is a roughly 32-hectare landscape park south of Weil am Rhein's centre, about 1.5 km from the tri-border point with Switzerland and France. Its main axis, the Dr.-Peter-Willmann-Allee, runs about 1.5 km to the eastern end; the Krebsbach flows through the grounds. A concrete-edged pond with a metal-railed platform and three mesh panels on posts sits among trees.

The park was created for the Grün 99 state garden show, held from 30 April to 17 October 1999 and visited by 855,000 people. It was the first trinational garden exhibition, with contributions from Switzerland and France. The Freiburg office Krupp, Losert und Partner won the 1994 competition; the city invested 42 million marks, including 23 million for the show itself.

The name comes from the tri-border point about 1.5 km away, where Germany, Switzerland and France meet. The 1999 garden show was the first trinational one, with Swiss and French contributions; 35% of visitors came from Switzerland and about 15% from France. The closing ceremony featured a Chienbäse fire display from Liestal.

The park lies south of Weil am Rhein's centre at about 258 m above sea level, framed by the B 317 and the Weil am Rhein–Lörrach railway to the north. The main paths alone run over seven kilometres; the Dr.-Peter-Willmann-Allee stretches about 1.5 km from the main entrance to the eastern part. Surfaces vary between paving, fine gravel and asphalt, and most side paths run at right angles to this axis.

The park's main axis, Dr.-Peter-Willmann-Allee, runs about 1.5 km from the main entrance to the eastern end, named after the mayor who pushed for the garden show. The Krebsbach stream crosses the grounds on its way to the Wiese. The park lies at roughly 258 m above sea level, 15 to 20 m below the town centre.