Stumped by this crossword clue? Unlock the mystery of the Swiss/Liechtenstein border river!

The answer to the crossword question is “Rhine.” The Rhine is a major river in Europe that forms the border between Switzerland and Liechtenstein. It is one of the longest and most important rivers in the continent, spanning over 1,200 kilometers from its source in the Swiss Alps to its mouth in the North Sea. Along its course, the Rhine cuts through several countries including Germany, France, and the Netherlands, and it is renowned for its historical, cultural, and economic significance. It serves as a vital transportation route, provides water for agriculture and industry, and is home to diverse ecosystems. The Rhine is also known as a popular tourist destination, attracting visitors with its scenic beauty, picturesque towns, and iconic landmarks such as the Rhine Falls.