Cairo Metro Line 3 is a main line of the Cairo Metro mass transit system in Greater Cairo, Egypt.Currently, the line connects Attaba in east-central Cairo with Abbasia and Heliopolis to the northeast. The line will eventually extend from the northwest of the Greater Cairo area at Imbaba to the northeast serving Cairo International Airport. The line will cross the River Nile twice at the western branch between Kit Kat and Zamalek and the eastern branch between Zamalek and downtown Cairo.