Shirebourne brook

It may have marked the historic county boundary between Hertfordshire and Middlesex.

The Shirebourne rises in King George's Fields, Hadley.

It is culverted between the eastern side of the Fields at Bosworth Road until it emerges overground at the south-west corner of the Victoria Recreation Ground in New Barnet.

The brook may originally have been named Scirbrunan in old English which translates as "shirebourn" meaning "county stream".

The brook may be the one that formed the county boundary between Hertfordshire and Middlesex.