Jilešovice-Děhylov, Natural monument and protected area in Dobroslavice, Czech Republic.

Jilešovice-Děhylov is a natural monument on floodplain deposits in the Dobroslavice cadastre, on the right bank of the Opava between Hlučín and Děhylov near Hlučínské jezero. It covers 18.82 ha and comprises the unused Poštovní rybník pond with its islets and wetlands, wetlands of the former Děhylov pond system, and meadows by the right-bank dike.

The site is nearly identical to the same-named Site of Community Importance of 18.82 ha within Natura 2000, and the southwestern boundary of the protected zone is formed by the Ostrava–Opava railway line. Protection targets the meadow growth of Sanguisorba officinalis and Myrmica ants, on which the marsh fritillary relative Maculinea nausithous depends.

The reserve's name joins the villages of Jilešovice and Děhylov, though the site lies in the Dobroslavice cadastre. The meadows are mown to keep great burnet (Sanguisorba officinalis) flowering, and the scarce large blue (Phengaris nausithous) lays its eggs on the flowerheads. The caterpillars then drop to the ground, where Myrmica ants carry them into their nests to overwinter and pupate.

The site lies by road II/469 between Děhylov and Hlučín, and by the Děhylov stop on the Ostrava-Svinov to Opava východ line. An asphalt lane from II/469 leads to the Rybárna cottage settlement. The Ostrava–Opava railway forms the southwestern boundary of the protected area.

The site's core is the unused Poštovní rybník pond with its islets and wetlands, joined by marshes of the former Děhylov pond system and meadows by the right-bank dike of the Opava. The river's own channel lies outside the protected zone.