Dreiländereck, Border monument in Kleinhüningen, Basel, Switzerland

Dreiländereck is an 18.70-metre steel pylon by the Rhine harbour in Basel, designed by Wilhelm Münger in 1957. Three curved elements of 15-millimetre rolled and welded plate spiral around a central tube, tapering to a point; the three national flags sit at the base. The silver monument bears blue and red stripes and a red square with a white cross.

The monument was built in 1957 after local authorities approved funding for this project at the border of three countries. It was part of a plan to mark this important geographical point in the region.

The three national flags sit in the corner where the three iron elements meet at the base, so the flags are part of the sculpture itself rather than separate poles. The form is said to recall a ship's propeller or three wings pointing toward the three countries.

The monument is located in Basel's port area and is easy to reach on foot, especially from the riverbank. There is a restaurant and a passenger boat landing nearby that make a visit convenient.

The monument was designed by a Hungarian mathematician who created a specific geometric form to symbolize the three countries. The precise engineering of this structure shows how artistic design and mathematical calculation came together.