Idkū, town, northern Al-Buḥayrah muḥāfaẓah (governorate), Lower Egypt. It lies on a sandy strip behind Abū Qīr Bay, in the northwestern Nile River delta. Immediately south is Lake Idku, a 58-square-mile (150-square-km) lagoon that stretches some 22 miles (35 km) behind and parallel to the coast and has a maximum width of 16 miles (26 km). Drained by Al-Maʿaddiyyah Channel, connecting with the Mediterranean, the lagoon is reputed to be the ancient Canopic branch of the Nile. Idkū’s isthmus position enables it to capitalize on the fisheries of both the lagoon and the Mediterranean. Other industries include rice milling and silk weaving. Idkū is linked by coastal road and railway to Alexandria, 26 miles (42 km) to the west-southwest, and Rosetta (Rashīd), 12 miles (19 km) northeast. Pop. (2006) 97,168.