|Location:||20km south of Skopje, in the Canyon of Matka, on the right bank of Treska River.|
|As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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|2000||developed with electric light.|
Vrelo Špilja is located in the Canyon of Matka, next to the springs of Koritiste, on the right bank of the Treska River. The cave has two huge halls, and two lakes. The small lake is 8m long and 15m deep. The large lake is 35m long, 4m wide, and 18m deep. Highlight is a three metre high stalagmite, which is called Pine Cone because of its characteristic shape.
The cave was developed by the Peoni Speleological Society with financing from the Open Competition Fund of the EU Phare Cultural Development Program. The new developments were inaugurated in 2000.
The lower level of the cave is waterfilled. It is a 425m long almost horizontal passage which fionally reaches a depth of 67m below the water level. From here a deep shaft goes down at least to 330m below the highest surface of the river. This made this cave the deepest waterfilled cave of the world for several years, however, since 2016 the deepest is Hranická propast in Czechia with -404m, and this is only second. It is still the deepest spring in the Balkans.
The water cave was explored by the Italian cave diver Luigi Casati, who is part of an international team of explorers. Casati is using Aquatek Voyager rebreathers and a bail-out open circuit decompression line with different gas mixes. During the exploration he set a new world record for cold water rebreather cave diving. The exploration is still ongoing.