The parish is traversed from west to east by Glencorse Burn, part of whose valley contains Glencorse Reservoir, which was formed in 1819-28 by damming the burn's glen with a huge embankment high. The reservoir is a source of Edinburgh's water supply. Also in the parish are Glencorse Barracks, Bush House, Glencorse House, Woodhouselee and Easter Howgate. The northern part of the parish includes some of the Pentland Hills and the highest point within the parish is Turnhouse Hill ().