The Sungai Besi Expressway (Expressway 9, E9) is a controlled-access highway in the Klang Valley region of Peninsular Malaysia. The 28.3-kilometre (17.6-mile) expressway runs between Serdang and Ampang, Selangor through southeastern Kuala Lumpur, parallel and directly adjacent to the North–South Expressway and the Kuala Lumpur–Seremban Expressway.