Basel ( BAH-zəl; German: [ˈbaːzl̩] ), also known as Basle, is a city in northwestern Switzerland on the River Rhine (at the transition from the High to the Upper Rhine). Basel is Switzerland's third-most-populous city (after Zurich 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 the local Basel German dialect. https://en.wikipedia.org/wiki/Basel