The West Anglia Main Line is one of the two main lines that operate out of Liverpool Street, the other being the Great Eastern Main Line, which operates services to Ipswich and Norwich via Colchester. It runs generally north through Cheshunt, Broxbourne, Harlow, Bishop's Stortford and Audley End (near Saffron Walden) to Cambridge, with branches between serving Stratford, Hertford and Stansted Airport. The line runs along the boundary between Hertfordshire and Essex for much of its length. For details on the routes in the London area, refer to the Lea Valley Lines article.