Esch-sur-Alzette is a city in the Grand Duchy of Luxembourg and the country's second-most populous commune, with a population of 36,625 inhabitants, as of 2023. It lies in the south-west of the country, on the border with France and in the valley of the Alzette, which flows through the city. The city is usually referred to as just Esch; however, the full name distinguishes it from the village and commune of Esch-sur-Sûre which lies 45 kilometres further north. The country's capital, Luxembourg City, is roughly 15 km (9.3 mi) to the north-east. Esch was selected as the European Capital of Culture for 2022, alongside Kaunas and Novi Sad.

Luxembourg, also known as Luxembourg City, is the capital city of Luxembourg and the country's most populous commune. Standing at the confluence of the Alzette and Pétrusse rivers in southern Luxembourg, the city lies at the heart of Western Europe, situated 213 km (132 mi) by road from Brussels, 372 km (231 mi) from Paris, and 209 km (130 mi) from Cologne. The city contains Luxembourg Castle, established by the Franks in the Early Middle Ages, around which a settlement developed.