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In page Basel:

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Basel is located in Northwestern Switzerland and is commonly considered to be the capital of that region.[citation needed][1] It is close to the point where the Swiss, French and German borders meet, and Basel also has suburbs in France and Germany.[2] As of 2016, the Swiss Basel agglomeration was the third-largest in Switzerland, with a population of 541,000[3] in 74 municipalities in Switzerland (municipal count as of 2018).[4] The metropolitan area, called the Trinational Eurodistrict of Basel (TEB), consists of 62 suburban communes including municipalities in neighboring countries, and counted 829,000 inhabitants in 2007.[5]