Oberbaselbiet: Laufmatt - Bölchenfluh - Eptingen

The Belchen Tunnel is a motorway tunnel in Switzerland, and forms part of the A2 motorway from Basel to Chiasso. It links Eptingen in the canton of Basel-Country with Hägendorf in the Canton of Solothurn. The tunnel was opened in 1966, and is 3,180 metres (10,430 ft) long.The tunnel was completely renovated in 2003.

Eptingen (Basel German: Eptige) is a municipality in the district of Waldenburg in the canton of Basel-Country in Switzerland.

The Belchenflue is a mountain of the Jura, located on the border between the Swiss cantons of Basel-Landschaft and Solothurn, south of Eptingen. The mountain is also known as the Swiss Belchen (Schweizer Belchen) and is part of the so-called Belchen System, a group of mountains with the name "Belchen" that may have been part of a Celtic sun calendar.]].

Belchenflue Pass (el. 1099 m.) is a high mountain pass in the Jura Mountains between the cantons of Basel-Country and Solothurn.The pass is also called Bölchen by locals. The name came originally from Celtic from the sun god Belenus. The nearby peak of the same name (el. 1099 m.) was an important marker for the tribal calendar establishing the seasons.

Chilchzimmersattel (el. 991 m.) is a mountain pass in the Jura Mountains in the canton of Basel-Country in Switzerland.It connects Eptingen and Langenbruck. The pass road has a maximum grade of 7,35 percent. The pass is open all year round, even though it is not cleared after snowstorms.Numerous fortifications can be seen near the pass, dating from World War I and before.

The Ruchen is a mountain of the Jura, located on the border between the Swiss cantons of Basel-Landschaft and Solothurn. It lies between Langenbruck and Eptingen. The Ruchen is the easternmost summit above 1,100 metres in the Jura Mountains. East of the Ruchen is the Belchenflue.