| Kotra | |
|---|---|
 Kotra River in Pogarenda (Belarus-Lithuania border) | |
| Location | |
| Country | Belarus, Lithuania |
| Physical characteristics | |
| Source | |
| • location | 22 km southeast from Varėna |
| Mouth | Neman |
| • coordinates | 53°33′53″N 24°02′36″E / 53.56472°N 24.04333°E / 53.56472; 24.04333 |
| Length | 109 km (68 mi) |
| Basin size | 2,010 km (780 sq mi) |
| Discharge | |
| • average | 12.8 m/s (450 cu ft/s) |
| Basin features | |
| Progression | Neman→ Baltic Sea |
| Ramsar Wetland | |
| Official name | Cepkeliai mire |
| Designated | 20 August 1993 |
| Reference no. | 625 |
| Ramsar Wetland | |
| Official name | Kotra |
| Designated | 21 October 2002 |
| Reference no. | 1216 |
The Kotra (Belarusian: Котра; Lithuanian: Katra) is a 109-kilometre-long (68 mi) river in Belarus and Lithuania. The river is an example of a rare phenomenon of river bifurcation.
At first, the Kotra and Ūla form one river, known as the Pelesa, which originates in Belarus and flows in a northwesterly direction. Just past the Belarus–Lithuania border, between the villages of Paramėlis [lt] and Kazliškės, some 22 kilometres (14 mi) southeast of Varėna, it branches out into two independent rivers: the Kotra, a tributary of the Neman, and the Ūla, a tributary of the Merkys. The bifurcation happened in the second half of the 19th century when the Ūla, due to its channel erosion, crossed the water divide between its own and the Kotra's drainage basins. As a result, the Ūla enlarged its basin by some 410 square kilometres (160 sq mi) and the Kotra lost two of its tributaries. These processes also caused a decrease in groundwater levels and the almost total disappearance of several lakes in the area.
The Kotra flows along the Belarus–Lithuania border for 24 kilometres (15 mi) and the remaining 85 kilometres (53 mi) through Belarus. It then flows along the southern border of Čepkeliai Marsh, the area protected as a nature reserve With the changes in drainage basins and groundwater levels, some 20 square kilometres (7.7 sq mi) of open marshes overgrew with trees. The Kotra and its surrounding marshes form wetlands of international importance: Kotra Ramsar site and Cepkeliai Ramsar site Varėna district municipality established a 1.085-square-kilometre (0.419 sq mi) reservoir to protect the natural Kotra environment.
Etymology
The name Katra/Kotra is very unclear. Aleksandras Vanagas reconstructed a very dubious Proto-Indo-European root *kataro- ('a trench, rivulet, stream', as for Italian river Catarona or Liburnian river Καταρβάτης) from which originated the name of the river. Simas Karaliūnas suggested a Slavic borrowing in Lithuanian katãryti/katãlyti (from Russian: колотить, колотать) 'to beat, to whip' as a possible source of the name. Edward Bogusławski presented Kotra as a Finno-Ugric name (without further elaborating it; Rimvydas Kunskas suggested Finnish: *kaatarha 'to flood (kaataa) a backgarden (tarha)'). Šarūnas Šimkus suggests the name may come from a pronoun Lithuanian: katrà, katarà, Russian: котора(я), Ukrainian: котра 'which ' (fem.) as a reference to a very tangled upper course of this river.
References
- ^ "Cepkeliai mire". Ramsar Sites Information Service. Retrieved 25 April 2018.
- ^ "Kotra". Ramsar Sites Information Service. Retrieved 25 April 2018.
- "Cepkeliai mire | Ramsar Sites Information Service".
- Šimkus, Šarūnas (2023). Varėnos krašto vietovardžių etimologinis žodynas (in Lithuanian). Vilnius: Liutauras Leščinskas. p. 29-30. ISBN 978-609-447-388-3.
- Simas Sužiedėlis, ed. (1970–1978). "Katra". Encyclopedia Lituanica. Vol. III. Boston, Massachusetts: Juozas Kapočius. p. 70. LCCN 74-114275.
- Jonas Zinkus; et al., eds. (1986). "Katra". Tarybų Lietuvos enciklopedija. Vol. 2. Vilnius: Vyriausioji enciklopedijų redakcija. p. 240.
- "Cepkeliai". Long Term Ecological Research (LTER) Network in Lithuania. Institute of Ecology of Vilnius University. Accessed 9 October 2006.
External links
- Information Sheet on Ramsar Wetlands (PDF)
- Environmental Changes in the Ūla and Katra Upper Reaches During the Last 14,000 Years (PDF)
- Čepkeliai Marsh and Kotra River
| Tributaries of the Neman River | ||
|---|---|---|
| Main tributaries of the left bank |  | |
| Main tributaries of the right bank | ||
| Distributary |
| |