Although the majority of these towns are situated in the borough, many smaller settlements that comprise them are located in adjacent boroughs. Approximately a third of Chiswick – north of the London Underground (District/Piccadilly line) railway line – falls within the London Borough of Ealing. A few roads in Brentford (around Claypond Hospital) and Isleworth (south of the River Crane and around Whitton) lay within the London Boroughs of Ealing and Richmond upon Thames respectively. A significant minority of Hounslow – south of the railway and southeast of Hounslow Heath – fall within the London Borough of Richmond upon Thames, whilst some of Hounslow – west of the River Crane – falls within the London Borough of Hillingdon. Minor parts of Feltham fall within the Borough of Spelthorne in Surrey, meaning that these parts of the town are situated outside Greater London.
Although the majority of these towns are situated in the borough, many smaller settlements that comprise them are located in adjacent boroughs. Approximately a third of Chiswick – north of the London Underground (District/Piccadilly line) railway line – falls within the London Borough of Ealing. A few roads in Brentford (around Claypond Hospital) and Isleworth (south of the River Crane and around Whitton) lay within the London Boroughs of Ealing and Richmond upon Thames respectively. A significant minority of Hounslow – south of the railway and southeast of Hounslow Heath – fall within the London Borough of Richmond upon Thames, whilst some of Hounslow – west of the River Crane – falls within the London Borough of Hillingdon. Minor parts of Feltham fall within the Borough of Spelthorne in Surrey, meaning that these parts of the town are situated outside Greater London.