Baden, sometimes unofficially, to distinguish it from other Badens, called Baden bei Zürich or Baden im Aargau, is a town and a municipality in Switzerland. It is the main town or seat of the district of Baden in the canton of Aargau. Located 25 km (16 mi) northwest of Zürich in the Limmat Valley mainly on the western side of the river Limmat, its mineral hot springs have been famed since at least the Roman era. Its official language is German, but the main spoken language is the local Alemannic Swiss-German dialect. As of 2018 the town had a population of over 19,000.

Zürich is the largest city in Switzerland and the capital of the canton of Zürich. It is located in north-central Switzerland, at the northwestern tip of Lake Zürich. As of January 2023 the municipality had 443,037 inhabitants, the urban area 1.315 million (2009), and the Zürich metropolitan area 1.83 million (2011). Zürich is a hub for railways, roads, and air traffic. Both Zurich Airport and Zürich's main railway station are the largest and busiest in the country.