Modravské slatě, Natural monument in Modrava, Czech Republic

Modravské slatě is the largest complex of raised bogs in the Bohemian Forest, lying west and southwest of Modrava between 980 and 1368 m above sea level and covering 3615 hectares. Old district maps record 28 individual bogs here, among them Rokytská slať, Roklanská slať and Přední and Zadní Mlynářská slať. The bogs are mostly slope mires fed by seepage and springs of the upper Vydra, with peat spruce stands and many small pools.

The peat bogs formed during and after the last ice age when melting ice left behind waterlogged depressions where plants accumulated and decomposed slowly. Over millennia, successive layers built up the thick peat deposits that define the landscape today.

The German name Weitfällerfilze refers to the moor complex, and the individual bogs carry names recorded on old district maps, which listed 28 of them, including Roklanská slať and Přední and Zadní Mlynářská slať. The Mrtvý les, or Dead Forest, is a stand of tree skeletons whose roots were damaged by an underground peat fire.

The reserve is closed to the public as zone I of the Šumava National Park, so the bogs cannot be entered. Views over the moorland are possible from marked trails around Modrava and Březník, and the red-marked national park route forms the northern boundary. The Modrava–Březník path passes the site.

The peat layers act like an archive, preserving records of climate and vegetation going back thousands of years in their stratification. Scientists study these deposits to read the region's past environmental conditions and track how nature has shifted over time.