Nahr al-Kalb, also known as the Dog River, is a historic natural landmark located in Lebanon, just north of the capital Beirut. This river has carved its way through the Lebanese mountains and served as a strategic location for various conquering armies throughout history, as evidenced by the numerous inscriptions and monuments left by these civilizations along its banks. The river flows into the Mediterranean Sea, and the site is a testament to Lebanon's rich cultural heritage. Near Nahr al-Kalb is the famous Jeita Grotto, a system of two separate, but interconnected, limestone caves spanning an overall length of nearly 9 kilometers. Recognized as one of the world's most beautiful cave systems, Jeita Grotto offers a surreal experience with its stalactites, stalagmites, and an underground river that is partially navigable by boat. The upper gallery houses the world's largest known stalactite and is accessible by a cable car, while the lower gallery can be explored by boat.