Ratajské rybníky, Natural monument in Hlinsko, Czech Republic.

Ratajské rybníky is a natural monument of 11.4 ha in the Kameničská vrchovina, about 2 km northeast of Hlinsko. It consists of three flow-through ponds built in a cascade: Horní Rataják (around 1855, 16,714 m²), Prostřední Rataják (around 1970, 7,260 m²) and Dolní Rataják (around 1910, 13,358 m²), each up to 1.7 m deep, separated by narrow strips of bank vegetation and wetlands.

The ponds were built in stages over more than a century, with the upper pond dating to 1855 and the lower to 1910. The middle pond was added much later in 1970 as the system expanded.

Local fishermen still work these ponds following seasonal patterns passed down through generations. The autumn harvests remain an important part of the community's connection to the water.

The ponds lie about 2 km northeast of Hlinsko's centre, in a broad valley at 585–595 m; the lower pond sits by the forest area Na balkovském. The water level is regulated by outlets in the dams and by overflow spillways for high water. The site is a natural monument within the Žďárské vrchy Protected Landscape Area, with a 50 m protective zone.

The ponds harbor rare butterfly species that are difficult to spot elsewhere in the region. Species like the Scarce Large Blue demonstrate why this small area has been given protected status.