The name Dollis is probably derived from the Middle English word 'dole', meaning the shares of land in the common field.

[1] It passes through Wyatts Farm Open Space and Brook Farm Open Space to Totteridge Lane near Totteridge and Whetstone Underground station, and then continues south through Woodside Park (where it merges with Folly Brook) and West Finchley, before passing under the Dollis Brook Viaduct which carries the Northern line between Finchley Central and Mill Hill East Underground stations.

Upper Dollis Brook between Mill Hill and Woodside Park, including neighbouring open spaces, is a Site of Borough Importance for Nature Conservation, Grade I.

[3] Lower Dollis Brook is a Site of Borough Importance for Nature Conservation, Grade II.

[2] It is less ecologically rich than Upper Dollis Brook, but nevertheless forms a valuable green corridor through suburban areas.