The lakes around Salzburg are gorgeous. Less well known, but also of spectacular beauty, are the many lakes sprinkled among the mountains of southern Austria, in the province of Carinthia. Not only are these lakes lovely, but in summertime their waters warm to a comfortable temperature for swimming. Another plus: this patchwork of southern lakes is surrounded by majestic mountains including the mighty Dolomites whose jagged peaks form the border between Austria and Italy.