WebBasel (/ ˈ b ɑː z əl / BAH-zəl, German: ⓘ), also known as Basle (/ b ɑː l / BAHL), is a city in northwestern Switzerland on the river Rhine. Basel is Switzerland's third-most-populous city (after Zürich and Geneva), with 177,595 inhabitants within the city municipality limits. The official language of Basel is Swiss Standard German and the main spoken language is …