The civil parish comprises
1,850 acres/749 hectares, four miles west of
Newbury, Berkshire. Latitude
is 51.38831°(+N/-S)
and longitude is -1.40973°(-W/+E). The
Ordnance Survey grid
reference is SU
4165.
For centuries the most
northerly stream of the river Kennet formed the
northern boundary, but in 1991 this boundary was
pushed a little further north, and now runs along
the railway.
The western boundary also
changed in 1991, and now runs along Old Lane.
The river Enborne forms part
of the southern boundary.
See a map of the
present-day parish
(Image produced from
the Ordnance Survey Get-a-map service with
permission of Ordnance Survey and Ordnance Survey
of Northern Ireland.)
Adjoining parishes (clockwise from north) are Speen,
Enborne, East Woodhay (Hants), West Woodhay and
Kintbury.
All of Hamstead to the west of
Ash Tree Corner lies within the North Wessex Downs Area of Outstanding
Natural Beauty.