Lake Ruda Woda ([ˈruda vɔda]; German: Röthloff See) is a long freshwater ribbon lake in Powiśle region in northern Poland. The lake lies entirely within Gmina Małdyty in Warmian-Masurian Voivodeship and is an integral part of the Elbląg Canal. Stretching 12 kilometres (7.5 mi) in length, the lake features four distinct bays and several islands. The lakebed is diverse, with numerous depressions and shallows. Shores are mostly high and steep, surrounded by temperate deciduous forest, with only the southern and northern parts bordered by fields and meadows. Lake’s surroundings are sparsely populated with several villages located nearby, including Wilamowo, Szymonowo, Szymonówko, Sople and Liksajny. The lake provides fishing and recreation opportunities, including sailing, kayaking and jet skiing. Several public piers scatter around the lake facility access to convenient entry points for swimming and sunbathing. Scouting camp is located in the northern part of the lake.
Name The name "Ruda Woda" (literally meaning "red/rusty water") was assigned in 1950 by the Polish Commission for the Determination of Place Names. The commission, which operated after World War II under the Ministry of Public Administration, was tasked with creating toponyms for locations, villages, towns, and cities in the former eastern territories of Germany. One of the earliest preserved mentions of the original German name of the lake—Röthloff (or Roethloff) See —appears in 16th-century historical documents, although the name must have been in use much earlier. The name Röthloff is found in a document from the Teutonic Order dated 1522, in which Grand Master Albert granted fishing rights on Lake Röthloff to brothers Paul and Wolf Fasolt from Iława. This name also appears on a 16th-century map of the Oberland region of Prussia by Caspar Henneberg from 1576. The etymology of the name Röthloff See is not precisely known. The name may derive from the German surname Rothloff or many of its variants including Ruttloff, Rutlaf, Roltloff, and Rotleff. Notably, the first part of the name can be traced to the Old Germanic word "rot," meaning red, which influenced the Polish name given after World War II. An unofficial but commonly used name for the lake is "Lake Duckie / Dudzkie" (IPA: dut͡skʲɛ). This name originates from the Ducki Canal (German: Dutzkanal), which links Lake Ruda Woda to Lake Bartężek, located to the southeast.
Geography and hydrography
Geological history
Lake Ruda Woda is an example of a ribbon lake formed in central Europe during the final phase of the most recent glaciation, approximately 14,000-12,000 years ago. As rivers flowed beneath the retreating glacier, they encountered softer rock, carving out deep channels known as glacial troughs. With the warming climate, blocks of dead ice melted, leaving behind long, narrow, and relatively deep lakes. The chain of lakes, including Sambód, Ruda Woda, Ilińsk, and Drwęckie, reflects the course of the local post-glacial trough. The melting glacier deposited layers of clay, sand, and gravel and created sequences of moraine hills, which are visible in the southern part of the lake.
Geography Ruda Woda Lake is located in northern Poland, within the macroregion of the Pojezierze Iławskie (Iława Lake District), which is ethnographically classified as part of the Powiśle region. Historically, this area belonged to the German province of Upper Prussia (German: Oberland). The region is sometimes mistakenly considered part of Masuria, specifically the Western Masuria, which is neither a distinct geographic nor ethnographic region but rather a tourist brand
Morphometry and morphology
The long and narrow lake runs in a north-south direction, and its course is characterized by numerous bends. The total length of the lake, measured along the centerline, is 12.01 kilometres (7.46 mi), with an average width of only 497 metres (1,631 ft). At its widest point, the lake measures 1,650 metres (5,410 ft). While historical sources often list the lake's area as 654.1 ha (2.525 sq mi) —a figure that continues to be incorrectly cited— modern government topographic maps show it as 613.4 ha (2.368 sq mi). The coastline is 35.8 kilometres (22.2 mi) long. Two distinct, noticeably shallower bays can be found to the east and west of the main body of water. The western bay near the village of Sople contains three small islands. On the opposite shore of the western bay, where the former site once served to store and prepare wood for rafting, a scout camp has been established. The camp hosts annual sailing and scouting events. The eastern bay, known as Zatoka Drela (Drela Bay) or Żydowski Kąt (Jewish Corner), is where the lake's main tributary, the Drela River (German: Drehle), flows in. The name Żydowski Kąt (Jewish Corner) originates from wartime stories among the local population, which claim that the Jewish owner of a nearby inn and his family were drowned in the lake. Stretching to the southeast, Drela Bay, together with the lake's main route, forms a peninsula known as Stańkowo. In the southern part of the lake, two small bays extend northwest, where the village of Liksajny is located. The lake features seven uninhabited islands, the largest of which is situated in the northern part, opposite the village of Wilamowo.
Besides the Drela River, the lake is fed by smaller, unnamed tributaries that dry up seasonally. The largest of these are located near the villages of Wilamowo and Sople. Ruda Woda Lake is connected by the Elbląg Canal to Lake Rakówka (German: Krebs) and then Ilińsk to the south, and to Lake Sambród to the north. At the four-kilometer mark (counting from the southern end) on the eastern shore, there is an entrance to the Ducki Canal, which connects Ruda Woda Lake with Lake Bartężek (German: Bärting See) to the southeast.
Bathymetry
The floor of Lake Ruda Woda is typical of lakes formed by rivers eroding the substrate under a glacier. The varying pressure from the ice caused the rivers to carve the lakebed in different directions, creating numerous depressions and shallows.
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