Tettnang is a town in the Bodensee district in southern Baden-Württemberg in Swabia region of Germany. It lies 7 kilometres from L…Tettnang is a town in the Bodensee district in southern Baden-Württemberg in Swabia region of Germany. It lies 7 kilometres from Lake Constance. The region produces significant quantities of Tettnang hop, an ingredient of beer, and ships them to breweries throughout the world.