The stream crosses the border from Lebanon into Israel between Shtula and Zar'it, and flows westward, emptying into the Mediterranean Sea south of Rosh HaNikra. The stream runs along a geological fault line through Dolostone and Limestone, and is fed along its course by springs. Currently, Mekorot (the national water company) pumps the water of the stream's springs, and has been accused of causing the stream to dry up. Many caves are formed on the banks of the stream, most notably the Keshet Cave (Rainbow Cave or Cave of the Arch).
Most of the stream is part of a nature reserve that bears its name. The reserve, declared in 1972 covers 7650-dunam and part of it reaches the Israel-Lebanese border. In 2009, 1225 dunams were added to the reserve.
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