Final answer:
The country with Lake Constance at its western end, primarily located in Switzerland and Germany, is Austria. It's a significant source of freshwater and a tourist attraction in Central Europe.
Step-by-step explanation:
The country that has Lake Constance, the third largest lake in central Europe that borders the western end of the country, but is mostly in Switzerland and Germany, is Austria. Lake Constance, known as Bodensee in German, lies on the Rhine at the northern foot of the Alps and is bordered by three countries: Austria, Germany, and Switzerland.
The lake is an important source of freshwater and is a popular destination for tourists because of its scenic beauty and the recreational activities available in the region.