Grenzach-Wyhlen is a municipality located in the district of Lörrach within the state of Baden-Württemberg, Germany. It has a population of approximately 15,000 people.
The municipality is situated on the right bank of the Rhine river. It shares borders with several neighboring areas, including the Swiss municipalities of Riehen and Bettingen in the Kanton of Basel-Stadt, as well as the German town of Rheinfelden and the German municipality of Inzlingen. The local town hall is positioned roughly 6.5 km east of Basel and 8 km south of Lörrach.