Basel has often been the site of peace negotiations and other international meetings. The Treaty of Basel (1499) ended the Swabian War. Two years later Basel joined the Swiss Confederation. The Peace of Basel in 1795 between the French Republic and Prussia and Spain ended the First Coalition against France during the French Revolutionary Wars. In more recent times, the World Zionist Organization held its first congress in Basel from 29 August through 31 August 1897. Because of the Balkan Wars, the (Socialist) Second International held an extraordinary congress at Basel in 1912. In 1989, the Basel Convention was opened for signature with the aim of preventing the export of hazardous waste from wealthy to developing nations for disposal.
Basel is located in Northwestern Switzerland and is commonly considered to be the capital of that region. It is close to the point where the Swiss, French and German borders meet, and Basel also has suburbs in France and Germany. As of 2016, the Swiss Basel agglomeration was the third-largest in Switzerland, with a population of 541,000 in 74 municipalities in Switzerland (municipal count as of 2018). The initiative Trinational Eurodistrict Basel (TEB) of 62 suburban communes including municipalities in neighboring countries, counted 829,000 inhabitants in 2007.
See Bædeker Switzerland (1877) Route 1, page 1 (Bâle)