Sarajevo is near the geometric center of the triangular-shaped Bosnia and Herzegovina and within the historical region of Bosnia proper. It is situated  above sea level and lies in the Sarajevo valley, in the middle of the Dinaric Alps. The valley itself once formed a vast expanse of greenery, but gave way to urban expansion and development in the post-World War II era. The city is surrounded by heavily forested hills and five major mountains. The highest of the surrounding peaks is Treskavica at , then Bjelašnica mountain at , Jahorina at , Trebević at , with  Igman being the shortest. The last four are also known as the Olympic Mountains of Sarajevo, having hosted the 1984 Winter Olympics which took place in the city. The city itself has its fair share of hilly terrain, as evidenced by the many steeply inclined streets and residences seemingly perched on the hillsides.