What is Aarau?
{{Infobox Swiss town | subject_name = Aarau | municipality_name = Aarau | municipality_type = municipality | imagepath_coa = CHE Aarau COA.svg|pixel_coa= | map = Karte Gemeinde Aarau 2007.png | languages = German | canton = Aargau | iso-code-region = CH-AG | district = [[Aarau (district)|Aarau]] | postal_code = 5000 | municipality_code = 4001 | area = 8.94 |coordinates= {{coord}} | elevation = 381|elevation_description= | population = 15,619|populationof = December 2005 | popofyear = 2005 | website = www.aarau.ch | mayor = Marcel Guignard|mayor_asof=2004|mayor_party=FDP | mayor_title = | list_of_mayors = | places = | demonym = | neighboring_municipalities= [[Rohr, Aargau|Rohr]], [[Buchs, Aargau|Buchs]], [[Suhr, Aargau|Suhr]], [[Unterentfelden]], [[Eppenberg-Wöschnau]] (Solothurn), [[Erlinsbach, Aargau|Erlinsbach]] | twintowns = [[Neuchâtel]] (Switzerland), [[Delft]] (Netherlands), [[Reutlingen]] (Germany) |}} '''Aarau''' is the capital of the northern [[Switzerland|Swiss]] [[Cantons of Switzerland|canton]] of [[Aargau]]. The city is also the capital of the [[district]] of [[Aarau (district)|Aarau]]. Most of the people in the [[municipality]] speak [[german language|German]]. To the west of Aarau is the canton of [[Solothurn]]. It is the third-largest city in [[Aargau]] after [[Wettingen]] and [[Baden, Switzerland|Baden]]. == Geography and Geology == [[File:Aarau Altstadt.jpg|thumb|left|Aarau]] The old city of Aarau lies on a rocky cliff where the [[Aar]] river valley narrows at the southern foot of the [[Jura Mountains|Jura]] mountains. Newer parts of the city can be found farther south of the river valley. The neighboring municipalities are [[Küttigen]] to the north, [[Rohr, Aargau|Rohr]] and [[Buchs, Aargau|Buchs]] to the east, [[Suhr, Aargau|Suhr]] to the south-east, [[Unterentfelden]] to the south, and [[Eppenberg-Wöschnau]] and [[Erlinsbach]] to the west. Aarau and the other municipalities have merged over the years. The only exceptions are Unterentfelden