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Natural Points of Interest
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Borek Ponds 

Borek PondsThe complex of ponds was founded in place of the original swamps at the northern edge of the town of Ostrov in the 17th century and its original purpose was to irrigate fields along the Jáchymovský potok (Jáchymov Stream). The ponds are interconnected by gravity flow channels and they are commonly known as the Borek Ponds. The complex includes Borek, Velký Borek, Horní and Dolní Hlivice, Luční, Hluboký, Koňský and Ostrovský pond, known as Betoňák (Concrete Pond).
The town of Ostrov is planning to create a suburban forest park in the area, which should serve as a natural relaxation and leisure complex. A cycle path, a horse path, a monkey course, a themed fishing trail, a regional themed trail and a softball ground should be built in this complex.

A part of the complex with Hluboký rybník (Deep Pond) and its surroundings is a Site of European Community Significance included in the Natura 2000 project. It is the natural habitat of rare plants, such as the common reed (Phragmites australis), along the shores you may also find sweet cane (Acorus calamus) or the yellow iris (Iris pseudacorus) and floating-leaved pondweed (Potamogeton natans) on the pond surface. In the water you may see the insectivorous bladderwort (Urticularia australis) or duckweed (Lemna) in thick stands. Some ponds are drained for the summer season and thus, specific vegetations may grow on the bottom, e.g. marsh cudweed (Gnaphalium uliginosum) or toad rush (Juncus bufonius). Other ponds are land-filled and are overgrown with wetland vegetation and wetland loosestrife.

Borek PondsThe largest pond, Velký Borek (Large Borek), is intensively exploited for fish breeding. The area subject to protection because it is the habitat of great crested newt (Triturus cristatus). During reproduction, the newt lives in water where it lays eggs. Its larvae live in water and feed on plankton. In their later development phase, newts enter dry land where they hibernate under stones, in crevices or in mud layers. The newt has become endangered in consequence of water body control and drainage of wetlands. Its greatest enemy are predaceous fish species. Additional wildlife species frequently encountered in the area of the Borek Ponds is mainly the Eurasian coot (Fulica atra), wild duck (Anas platyrhynchos) as well as the mute swan (Cygnus olor), for which the vegetation along the pond shores provides ideal nesting grounds.