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The Ponor Glade
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This depression is enclosed all around by partially forested summits. The remarkable fact here is the water drainage system, namely the losing of water through whirlpools. At a reduced flow, only two whirlpools are active.

At high flows, caused by heavy rains or snow melting, these two whirlpools cannot drain all the water, which rises into normally dry areas and other whirlpools become active.

When all the whirlpools cannot handle the flow, the entire depression is covered by water resulting in a large lake. The surplus from the lake drains through a rocky threshold situated in the North-Western part of the depression and forming a surface torrent flowing into Cetăţi valley.

The water that flows through the depression originates in the Ponor karst spring, situated at the base of a stone wall. The spring is especially spectacular, having a small lake at the exit, supplied through a siphon. The karst spring water has travelled underground a long way from the Padiş plain, and the Trânghieşti, and Gârjoaba valleys where it got lost into sink holes.

From the karst spring, the stream has a small steeper sector, after which it turns 90 degrees to the right and takes a slower, winding course on a distance of 240 m, until it is lost through the whirlpools. Near the whirlpools, a few stone walls with caves complete the charm of this place.

Poiana Ponor is the only recognized karst plain in our country, having both the water supply and drainage from and to karst sources.
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