Lake Synevyr: The Carpathian Lake Whose Area Runs From 4.45 to 7.58 Hectares With the Water Level

Lake Synevyr (Синевир) lies high in the mountains of Zakarpattia Oblast in western Ukraine, at an elevation of 989 meters. It sits within the national nature park of the same name, and in 2003 was listed as a Ramsar wetland (a wetland of international importance). It is often introduced as the largest lake in the Ukrainian Carpathians, but its “size” cannot be given as a single figure, since the water level rises and falls with the season, changing both the lake’s area and its depth.

How do different sources state the lake’s figures? What exactly is being compared when it is called the “largest lake”? Along with how the lake formed and the legend behind its name, this article works through sources as of September 2026. Ukraine’s mountains and rivers in general are covered in our article on Ukraine’s land and water, and the national-nature-park system in our article on Ukraine’s protected areas.

In the Horhany Mountains, at the Head of the Terebli River

The Internet Encyclopedia of Ukraine (IEU), published by the University of Alberta’s Canadian Institute of Ukrainian Studies (CIUS), places Lake Synevyr in the southern part of the Horhany mountains of Zakarpattia Oblast, inside the Synevyr National Nature Park, and states that its water flows out into the Terebli River. This is a reprint of an entry that appeared in the print encyclopedia’s volume 5 (1993).

According to the wetland information sheet submitted to the Ramsar Convention secretariat (the updated version published in October 2022), the lake sits within Zakarpattia Oblast close to the border with Ivano-Frankivsk Oblast, and the nearest settlement is the village of Synevyrska Poliana. Three mountain streams flow into the lake, and its water passes underground on the lake’s western side before entering the Terebli River. The Terebli is a tributary of the Tysa River, which in turn flows into the Danube.

The national nature park’s official website explains that the lake’s water emerges as the Synevyr stream (Синевирський потік), 350 meters west of the lake and 60 meters below the crest of the mound of debris that dams it. The 2003 version of the information sheet gives this outlet’s elevation as 913 meters.

How the Protected Area Around the Lake Came About

According to the history page on the national nature park’s official website, a protected area to safeguard the lake existed even before the park did, established in 1974. Protection was later extended to the surrounding forests and wetlands, and the area became a national nature park on January 5, 1989. IEU also gives 1989 as the year the park was established, and states that it was Ukraine’s third national park.

The park also includes part of the constituent site of Europe’s UNESCO World Heritage beech forests (our article on the World Heritage beech forests). The park lists the primeval beech forest included in the World Heritage site as 2,865 ha.

Both Area and Depth Change With the Water Level

The most detailed figures for the lake’s size come from the Ramsar wetland information sheet. Both the April 2003 version and the updated version published in 2022 (based on 2012-2018 data) give the same numbers: the lake’s area ranges from 4.45 to 7.58 ha depending on how full it is, the average depth is 8-10 meters, the deepest point is 19 to 23.5 meters, and the volume of water is 350,000 to 460,000 cubic meters.

The 2022 information sheet states that the water level falls in winter, rises in spring, and varies with rainfall in summer and autumn, and gives the range of the level’s fluctuation as 4.0-4.5 meters. The national nature park’s official website gives the same fluctuation as “4.0-7.0 meters,” adding that the water level never falls below an elevation of 964 meters, and that the crest of the debris mound damming the lake sits at an elevation of 973 meters. It also explains that there is an underwater ridge in the middle of the lake that appears above the surface as a small island when the water level drops.

The Lake’s Figures, Source by Source

The “29 ha” at the bottom of the table is not the area of the lake itself, but the area of the wetland registered under the Ramsar Convention. According to the information sheet, the registered site includes, in addition to the lake, the shore up to 110 meters north and south, up to 500 meters west and 350 meters east, plus 200 meters of the stream flowing out of the lake. Of the registered site, 18 ha is said to be forest. Mistaking the lake’s area for the registered site’s area makes the lake look roughly four times bigger than it is.

What Is Being Compared When It’s Called “the Largest Lake in the Carpathians”?

Lake Synevyr is introduced as “the largest lake in the Ukrainian Carpathians.” The wording, however, varies slightly from source to source.

• Ramsar information sheet (2003): the largest lake in the Ukrainian Carpathians by area at full water (about 8 ha) and by volume (about 400,000 m³). The same sheet also describes the lake as “relatively small”
• Ramsar information sheet (2022): “small but” the largest natural body of water in the Ukrainian Carpathians
• IEU (national-nature-park entry, written 2008): the largest lake in the Ukrainian Carpathians
• National nature park’s official website: the largest naturally formed lake in the Ukrainian Carpathians
• Encyclopedia of Modern Ukraine (ЕСУ; volume 22, 2020, in an entry on a folk festival): the largest high-mountain lake in the Carpathians

Apart from ЕСУ, every other source limits the comparison to “the Ukrainian Carpathians,” not the Carpathian range as a whole (which also runs through Romania, Slovakia, and elsewhere). ЕСУ writes “the largest high-mountain lake in the Carpathians” without limiting the range, but does not say what it is being compared against. Looking at Ukraine as a whole, Lake Svityaz in the northwestern region of Polissia has a surface area of 24.2 km² and a maximum depth of 58.4 meters (our article on Ukraine’s land and water).

A Lake Formed Roughly 10,000 Years Ago, When a Valley Was Blocked

On how the lake formed, the Ramsar information sheets (2003 and 2022) state that, 10,000 to 11,000 years ago, a mountain slope collapsed and blocked the valley of the Ozirnyi stream (Озірний). The national nature park official website’s “Water bodies” page gives the same date, explaining that rock from a large landslide on the northern slope of Mount Krasna dammed the valley. IEU likewise describes it as a lake formed when a river was dammed by a landslide.

Landslide, or Earthquake?

Elsewhere on the same national nature park website, the lake’s introduction page states that the lake formed “10,000 years ago, by an earthquake.” Whether this means an earthquake triggered the landslide, or is a separate account, cannot be told from the page’s wording. Neither the information sheet nor the park’s “Water bodies” page mentions an earthquake.

The lake is also gradually being filled in. According to the information sheet, about 50 tons of sediment are carried into the lake each year, while less than 1 ton flows out, so 98% accumulates in the lake. The lakebed holds about 200,000 cubic meters of sediment, and there is said to be a section where 11-12 meters of mud has built up close to the surface. The 2003 information sheet places this section on the lake’s western side, while the 2022 sheet places it on the eastern side — the two versions disagree.

The Legend of “Syni” and “Vyr”

The lake’s name carries a legend. The national nature park’s official website tells the story of the shepherd Vyr (Вир) and Syni (Синь), the count’s daughter who loved him. In the story, the shepherd is killed at this spot, and the girl’s tears become the lake. On a peninsula of the lake stands a wooden sculpture, “Syni and Vyr,” 13 meters tall and weighing over 30 tons, depicting the two of them; the park states that Zakarpattia sculptors Ivan Brovdi and Mykhailo Sanychi made it in 1983-1984.

The park also writes that the lake is sometimes called “the Sea’s Eye” (Морське око), because the small island in the middle of the lake looks like the pupil of a blue eye. The legend is presented by the park as a piece of local lore, and the park’s page does not say when it was recorded. The 2003 Ramsar information sheet, too, describes the lake as “associated with legends and widely cherished by local people,” without going into the content of the legend.

Life in the mountains of the Carpathians is covered in our article on the Hutsuls, Boikos, and Lemkos, and Ukraine’s highest mountain is covered in our article on Hoverla.