Salhöhe Pass is a mountain pass

Mountain pass

A mountain pass is a route through a mountain range or over a ridge. If following the lowest possible route, a pass is locally the highest point on that route...

 in the Jura Mountains

Jura mountains

The Jura Mountains are a small mountain range located north of the Alps, separating the Rhine and Rhone rivers and forming part of the watershed of each...

 of Switzerland

Switzerland

Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 between Kienberg

Kienberg, Switzerland

Kienberg is a municipality in the district of Gösgen in the canton of Solothurn in Switzerland.-History:Kienberg is first mentioned in 1173 as Vlricus et Hartmannus de Chienberh. In 1276 it was mentioned as dorff ze Kiemberg.-Geography:...

 in the canton

Cantons of Switzerland

The 26 cantons of Switzerland are the member states of the federal state of Switzerland. Each canton was a fully sovereign state with its own borders, army and currency from the Treaty of Westphalia until the establishment of the Swiss federal state in 1848...

 of Solothurn

Canton of Solothurn

Solothurn is a canton of Switzerland. It is located in the northwest of Switzerland. The capital is Solothurn.-History:The territory of the canton comprises land acquired by the capital...

 and Erlinsbach

Erlinsbach, Aargau

Erlinsbach is a municipality in the district of Aarau of the canton of Aargau in Switzerland.-History:Erlinsbach is first mentioned in 1173 as Arnlesbah. In 1220 it was mentioned as Erndespah and in the 14th Century it was known as Erlispach....

 in the canton of Aargau

Aargau

Aargau is one of the more northerly cantons of Switzerland. It comprises the lower course of the river Aare, which is why the canton is called Aar-gau .-History:...

.

It connects Kienberg

Kienberg, Switzerland

Kienberg is a municipality in the district of Gösgen in the canton of Solothurn in Switzerland.-History:Kienberg is first mentioned in 1173 as Vlricus et Hartmannus de Chienberh. In 1276 it was mentioned as dorff ze Kiemberg.-Geography:...

 in Solothurn and Erlinsbach

Erlinsbach, Aargau

Erlinsbach is a municipality in the district of Aarau of the canton of Aargau in Switzerland.-History:Erlinsbach is first mentioned in 1173 as Arnlesbah. In 1220 it was mentioned as Erndespah and in the 14th Century it was known as Erlispach....

 in Aargau. The pass road has a maximum grade of 9 percent. Although it is the fastest route between Aarau

Aarau

Aarau is the capital of the northern Swiss canton of Aargau. The city is also the capital of the district of Aarau. It is German-speaking and predominantly Protestant. Aarau is situated on the Swiss plateau, in the valley of the Aar, on the river's right bank, and at the southern foot of the Jura...

 and Basel

Basel

Basel or Basle In the national languages of Switzerland the city is also known as Bâle , Basilea and Basilea is Switzerland's third most populous city with about 166,000 inhabitants. Located where the Swiss, French and German borders meet, Basel also has suburbs in France and Germany...

, traffic over the pass is moderate.

After the Bern citizens had conquered the Unteraargau

Unteraargau

The Unteraargau is the lower watershed of the Aar River in the Swiss canton of Aargau.-Geography:It corresponds approximately to the canton's southwestern districts of Aarau, Brugg, Kulm, Lenzburg and Zofingen...

 region in 1415, Salhöhe marked the border between the Old Swiss Confederacy

Old Swiss Confederacy

The Old Swiss Confederacy was the precursor of modern-day Switzerland....

 and the Further Austria

Further Austria

Further Austria or Anterior Austria was the collective name for the old possessions of the House of Habsburg in the former Swabian stem duchy of south-western Germany, including territories in the Alsace region west of the Rhine and in Vorarlberg, after the focus of the Habsburgs had moved to the...

n possessions of the Habsburg dynasty.