The Bahr Yussef (; "the waterway of Joseph") is a canal which connects the Nile River with Fayyum in Egypt. In ancient times, it was known as Mer-Wer (the Great Canal). This project was built at the time of Amenemhat III, who was also known as Moeris (similar to Mer-Wer). The Arabic name refers to the prophet Yusuf, the Quranic counterpart of the Biblical Joseph.