Dehetník, Natural monument in Líšnice, Czech Republic.

Dehetník is a 1.07-hectare wet meadow natural monument 900 m northwest of Líšnice, in a shallow valley drained by an unnamed stream flowing from Opršál pond to Pytlák pond. The stream forms its northern boundary; the eastern edge holds a sedge-bog community around a small overgrown pool.

Dehetník was declared a protected natural monument on 4 December 1985, effective from 1 February 1986, by the Písek district national committee. It originally covered 1.20 ha; on 19 July 2011 the South Bohemian regional council re-declared it at 1.07 ha after a 2006 survey showed the old boundaries followed outdated land parcels.

The name Dehetník refers to tar: dehet is Czech for tar, though the sources do not record how the meadow got the name. The site lies on the naučná stezka Kolem Milevska, an educational trail running along a field road from Milevsko to Líšnice, so walkers pass it on foot.

The monument lies on the Kolem Milevska educational trail, on a field road running from Milevsko toward Líšnice; the meadow is about 1 km southeast of Milevsko's edge and 900 m northwest of Líšnice. The northern boundary is an unnamed stream flowing from the Opršál pond to the Pytlák pond, and the terrain is nearly flat, rising only about 5 m. The wettest sedge-bog section in the east covers roughly 4% of the site and is easily trampled.

The pond on the site measured only about two square metres in 2006 and was heavily overgrown, yet it serves as a refuge for amphibians such as the fire-bellied toad and the pool frog. The wettest eastern strip, roughly 4% of the area, holds the small population of bogbean.