Melchnau

The ruins of Grünenberg Castle, Schnabelburg Castle and Langenstein Castle are a complex of three interconnected castles on a hill above the municipality of Melchnau in the canton of Bern in Switzerland. The three castles formed the center of power of the Barons of Grünenberg in the Oberaargau region during the High Middle Ages.

Reisiwil is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Busswil bei Melchnau is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Altbüron is a municipality in the district of Willisau in the canton of Lucerne in Switzerland.

Untersteckholz was a municipality in the district of Aarwangen in the canton of Bern in Switzerland. On 1 January 2010, Untersteckholz merged into Langenthal.

Grossdietwil is a municipality in the district of Willisau in the canton of Lucerne in Switzerland.

Gondiswil (local dialect Gumiswil) is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland.

Obersteckholz is a former municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. On 1 January 2021 the former municipality of Obersteckholz merged into Langenthal.

Roggliswil is a municipality in the district of Willisau in the canton of Lucerne in Switzerland.

St. Urban's Abbey (German: Kloster Sankt Urban) is a former Cistercian monastery in the municipality of Pfaffnau in the canton of Lucerne in Switzerland. It is a Swiss heritage site of national significance.

Gutenburg is a village in the canton of Bern, Switzerland. On June 7, 2006, the independent municipality decided to merge into the municipality of Madiswil. The merger was completed on January 1, 2007.

Madiswil is a municipality in the Oberaargau administrative district in the canton of Bern in Switzerland. Since January 1, 2007, Gutenburg is part of the municipality. On 1 January 2011 Kleindietwil and Leimiswil were merged with the municipality of Madiswil.