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Attendorn (German: [ˈatn̩dɔʁn] ) is a German town in the Olpe district in North Rhine-Westphalia. As of 2019 it had a population of 24,264.

The Biggesee or Bigge Reservoir (German: Biggetalsperre) is a reservoir in Germany. It lies in the southern part of the Sauerland between Olpe and Attendorn.

Attendorn station (German: Bahnhof Attendorn) is a railway station in the municipality of Attendorn, located in the Olpe district in North Rhine-Westphalia, Germany.

The Atta Cave (German: Atta-Höhle) or Attendorn Dripstone Cave (Attendorner Tropfsteinhöhle) in Attendorn is one of the largest dripstone caves in Germany. The cave was discovered during the quarrying of limestone at the Bigge Valley Limestone Works (Biggetaler Kalkwerk) on 19 July 1907 and was opened up by the owners to tourists that same year. Today the Atta Cave is the most-visited show cave in Germany, receiving around 350,000 tourists per year, and is an important economic factor for the town. Amongst its attractions are numerous calc-sinter flowstone drapes, colourfully tinctured by iron oxides. There are also many stalactites, stalagmites and stalagnates. Several pieces of calcite crystal formations were moved into the public area of the cave in order to be displayed there.

The Feldberg is a hill, 556.2 m above sea level (NN), in the Ebbe Hills Nature Park in the Sauerland in the German state of North Rhine-Westphalia.

Lister is a river of North Rhine-Westphalia, Germany.It is a tributary of the Bigge.

Neger is a river of North Rhine-Westphalia, Germany. It is a right tributary of the Bieke.

Bieke is a river of North Rhine-Westphalia, Germany. It is a tributary of the Bigge.

The Helgoland Island air disaster occurred on 9 September 1913 after the airship Zeppelin LZ 14 had been transferred to the Imperial German Navy on 7 October 1912. As the first airship owned by the Navy, it was given the serial number L-1. Ordered to participate in manoeuvers, it departed the mainland in bad weather. With 20 people on board, L-1 flew into a gale, and, while 18 miles from its destination, the cold rain caused its gas to contract, causing it to settle 20 mi (32 km; 17 nmi) north of Heligoland into the North Sea, breaking in two. The control car sank, drowning 13 of its occupants. Seven were rescued by motor torpedo boats.

Sondern is a village in Olpe district, in North Rhine-Westphalia, Germany. As of 2011 it had a population of 484 people. It contains a leisure complex and campsite on the shores of a lake.

Eichhagen station (German: Haltepunkt Eichhagen) is a railway station in the municipality of Eichhagen, located in the Olpe district in North Rhine-Westphalia, Germany.

Bigge is a river of North Rhine-Westphalia, Germany. It flows into the Lenne in Finnentrop.