The city of Mumbai consists of two distinct regions: Mumbai City district and Mumbai Suburban district, which form two separate revenue districts of Maharashtra. The city district region is also commonly referred to as the Island City or South Mumbai. Mumbai Suburban district lies to the north of Mumbai City district and comprises all of Mumbai's suburbs. The western part of the Mumbai Suburban district forms the Western Suburbs and the eastern portion forms the Eastern Suburbs. The suburbs of Chembur, Govandi, Mankhurd and Trombay lie to the south-east of the Eastern Suburbs. These suburbs are generally not considered as part of the Eastern Suburbs and are sometimes referred to as the "Harbour Suburbs".