The Čepkeliai Marsh () is the largest bog (a mire) in Lithuania. Located in Varėna District Municipality, south of Marcinkonys village and north of Kotra River, which flows along the Belarus–Lithuania border in this area. Its area is a nature reserve and a Ramsar site.
Protected status The area of the swamp is protected as a state nature reserve (Čepkēliai Reserve), with its administration in Marcinkonys, and part of the cross-border wetlands of international importance, the Kotra-Cepkeliai Transboundary Ramsar Site established in 2010. It consists of the Kotra Ramsar site in Belarus (designated in 2002) and the Čepkeliai Mire Ramsar site in Lithuania (designated in 1993). In 2011 the Čepkeliai Nature Reserve together with Dzūkija National Park were certified as PAN parks.Čepkeliai-Dzūkijos PAN Park, retrieved 21 January 2015
The bog itself covers an area of , while the larger area of which also includes some neighbouring sections of the Dainava Forest is declared as the Čepkeliai Nature Reserve. It was created in 1975, and is protected since 1960 (initially as a botanical-zoological sanctuary). It is also part of Natura 2000, the European ecological network.
Nature Most of Čepkeliai is a raised bog while there are some smaller areas of a fen and flooded forests. There are 21 small bog lakes in the area, some of them are Glacial Age relicts, remnants of larger lakes that have been swamped. The largest of them is the . The peat stratum is 5–6 metres thick.
It grows a lot of cranberries, wild rosemary, and heather. The reserve is a sanctuary for cranes, white-tailed eagles, black grouse, capercaillie, mountain hares, martens, smooth snakes.
Visiting The Čepkeliai Marsh is closed for visiting, except from the observation tower and an educational trail by the edge of the marsh south to Marcinkonys village. The track was closed since June 2021. Cranberry and mushroom picking is allowed for 10 days in early September for residents of the nearby villages with a permit, for personal use only.Justina Maciūnaitė, Artėja spanguoliavimo sezonas: kur uogauti ir kokio derliaus laukti ("Cranberry season is approaching: where to pick berries and what harvest to expect"), delfi.lt, 21 August 2018
Etymology The name Čepkeliai comes from a personal name , i. e. Čepkáuskas, Čepkẽvičius, , , which is a form of name Szczepan. As at the beginning of 20th century, this name was used only for small western part of the bog. The main part was called ("Russian woodland") in Slavic maps. The local Lithuanian name for this swampy and forested region was Gudo Šalis ("The Land of Gud").
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