The Cubuklu Valley Masterplan Project site occupies the base of a valley. Project area lies on the northern boundary of the Cubuklu Vadi area of in-city forest. It is the lowest point of the Cubuklu Valley area, and surface and ground water from a significant area of surrounding hills flows and permeates down to collect the site. The valley base forms a natural aquifer above the level of the Bosphorus, and this valley was once dammed at the western end to raise water levels and form a reservoir. The dam has been removed but some elements of historic engineering works remain.