During an eight-month campaign in 1915, Commonwealth and French forces sought to force Turkey out of the war, which would relieve the deadlock on the Western Front and open a supply route to Russia through the Dardanelles and the Black Sea.
One of the hills in the Sari Bair range was shown as being 700 feet above sea level, and its summit was marked with a small circle.
Maps showed another 700 foot hill immediately north of it, marked with a larger circle.
Allied forces made several attempts to recapture it over the following months, with major assaults on 2 May and 7 August but it remained in Turkish control for the rest of the campaign.
Special memorials commemorate ten Australian soldiers thought to be amongst its 449 unidentified burials.