The old city of Aarau is situated on a rocky outcrop at a narrowing of the Aare river valley, at the southern foot of the Jura mountains. Newer districts of the city lie to the south and east of the outcrop, as well as higher up the mountain, and in the valley on both sides of the Aare. The neighboring municipalities are Küttigen to the north, Rohr and Buchs to the east, Suhr to the south-east, Unterentfelden to the south, and Eppenberg-Wöschnau and Erlinsbach to the west. Aarau and the nearby neighboring municipalities have grown together and now form an interconnected agglomeration. The only exception is Unterentfelden whose settlements are divided from Aarau by the extensive forests of Gönhard and Zelgli. Approximately nine-tenths of the city is south of the Aar, and one tenth is to the north. It has an area, as of 2006, of 8.9 km² (3.4 sq mi). Of this area, 6.3% is used for agricultural purposes, while 34% is forested. Of the rest of the land, 55.2% is settled (buildings or roads) and the remainder (4.5%) is non-productive (rivers or lakes). The lowest elevation, 365 meters (1,198 ft), is found at the banks of the Aar, and the highest elevation, at 471 meters (1,545 ft), is the Hungerberg on the border with Küttigen.
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