The Macocha Abyss, also known as Macocha Gorge (Czech: Propast Macocha), is a sinkhole in the Moravian Karst cave system of the Czech Republic located north of the city of Brno, near the town of Blansko. The Punkva River flows through it. It is a popular tourist attraction for casual visitors to the region, in addition to cavers and advanced technical divers.
The sinkhole is about 138.7 meters deep and it is the biggest gorge of its kind in the Czech Republic and even in the Central Europe. The upper part of this nature unique is about 174 m long and 76 m wide. There are two platforms for tourists at the edges. The first one is Upper Bridge constructed in 1882. The second one is little bit lower called Lower Bridge. This lower bridge comes from 1899 and it is about 92 m above the bottom of Macocha that you can see from there.
Macocha Abyss (named in 17th century) was created by fall of ceiling of huge cave hole. That’s why its bottom is covered by debris. The River Punkva is rising here and fills up two small lakes called Horní (Upper) and Dolní (Lower). Horní lake is approximately 13m deep and you can see it from the Upper Platform. The Lower one is hidden between rocks and it is about 30 m deep.
Underground River Punkva is made by several local brooks which became bigger river underground. It is coming from north part of Moravský kras (Moravian Karst) to the east. Macocha Abyss is the only place where Punkva River goes to daylight. Then, the river goes its wandering in Punkvení jeskyně (Punkva Caves). The whole cave complex is made by more than 30 kilometers of underground passages partly filled with water.
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