Dupnisa is the first and only cave of Thrace to tourism. abuhava remaining cool under the influence of the Black Sea, Turkey and Bulgaria form the border, Rezve Stream Strandja Mountains that split by deep valleys, located in a region with a wild look. Dupnisa Cave consists of two layers and three caves connected to each other in a region covered with dense nebat covers where you can see every shade of green. Therefore, it is known as “Cave System”. The total length of the system is 2720 meters, the upper floor of the dry and girl caves. These caves have completed their development and are located 50-60 meters below the Sulu Cave. The total length of this cave is 1977 meters with an underground stream flowing through it and the entrance mouth is 345 meters above sea level. The end point is 61 meters above the entrance. One of the most well-known caves in the cave literature nisa Caves; It is a large underground system that has continued its development and development for about four million years. There is an underground river flowing in it and the lakes that are formed by this river and whose depth is more than 2 meters. The cave has rich drop stone formations. Milk is white to red and has all shades of brown; stalactites, stalagmites, columns reaching giant dimensions; The curtain has a fascinating appearance with flag drop stones and drop stone pools. In addition to this magnificent view, the cave air, which differs within short distances, is thought to be positive in terms of health. Although the upper floors are hot (average 17 degrees) and dry (60-70% pure moisture), the main cave is cooler (10-12 degrees) and moist (80-90%). This difference led to a clear wind between the upper floor and the main gallery. Dupnisa Caves, the second longest cave of Trakya; It was opened to tourism in 2003. The 200-meter section of the Dry Cave and the 200-meter section of the Sulu Cave, which consist of giant stalactites, stalagmites and columns, were opened to the top floor of the Dupnisa Caves. This 450-meter section features a hiking pier and lighting. These sections, which include underground river and deep lakes, offer beautiful opportunities for adventure and nature sports enthusiasts. Since its inception in June 2003, the Dupnisa Cave has been visited by tens of thousands of people every year.