The Dragoman Marsh is the biggest natural karst wetland in Bulgaria.

It is situated only 35 km north-west of Sofia and covers a valley between the limestone hills Tri Ushi and Chepan.

For years, the Dragoman Marsh has played an important role in flood control and agriculture in the surrounding areas.

[4] In the 1950s, the Dragoman Marsh was drained to make room for agricultural development.

However, drainage activities were halted in the early 1990s and the marsh began to revert to its original state.