Dupnisa Cave

Dupnisa Cave
A view from the inside Dupnisa Cave
Location of Dupnisa Cave in Turkey
Location	Sarpdere, Demirköy, Kırklareli
Coordinates	41°50′26″N 27°33′22″E / 41.84056°N 27.55611°E / 41.84056; 27.55611Coordinates: 41°50′26″N 27°33′22″E / 41.84056°N 27.55611°E / 41.84056; 27.55611
Length	3,200 m (10,500 ft)
Elevation	345–405 m (1,132–1,329 ft)
Show cave opened	2005; 12 years ago (2005)
Visitors	120,000 (2013)

The Dupnisa Cave (Turkish: Dupnisa Mağarası), aka Dupnisa Caves, is a show cave located in Kırklareli Province, northwestern Turkey, close to Bulgarian-Turkish border. The cave itself, unlike what the original name suggests, is actually three, interconnected caves divided into two separate floors. Its name is derived from the Bulgarian word Dupnitsa (Дупница), related to the word for "hole".

The cave is situated deep in the forest, along the Strandzha Mountain Range, 5.5 km (3.4 mi) southwest of Sarpdere village and 25 km (16 mi) southwest of Demirköy in Kırklareli Province. It is located at a distance of 58 km (36 mi) from the provincial seat of Kırklareli, and 230 km (140 mi) from the city of Istanbul.

The Dupnisa Cave is accessible via the Kırklareli-Dereköy route (State Road ), from the Dereköy-Sarpdere or Kırklareli-Üsküp-Çukurpınar-Sarpdere routes from the north, and on the Vize-Poyralı , Poyralı-Demirköy or the forementioned Demirköy-Sarpdere route from the south.