The Pregolya or Pregola (russian: Прего́ля; german: Pregel; lt, Prieglius; pl, Pregoła) is a

river A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...

in the

Russia Russia (, , ), or the Russian Federation, is a List of transcontinental countries, transcontinental country spanning Eastern Europe and North Asia, Northern Asia. It is the List of countries and dependencies by area, largest country in the ...

Kaliningrad Oblast Kaliningrad Oblast (russian: Калинингра́дская о́бласть, translit=Kaliningradskaya oblast') is the westernmost federal subject of Russia. It is a semi-exclave situated on the Baltic Sea. The largest city and administr ...

exclave.

Name

A possible ancient name by

Ptolemy Claudius Ptolemy (; grc-gre, Πτολεμαῖος, ; la, Claudius Ptolemaeus; AD) was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importanc ...

of the Pregolya River is Chronos (from Germanic *''hrauna'', "stony"), although other theories identify Chronos as a much larger river, the

Nemunas The Neman, Nioman, Nemunas or MemelTo bankside nations of the present: Lithuanian: be, Нёман, , ; russian: Неман, ''Neman''; past: ger, Memel (where touching Prussia only, otherwise Nieman); lv, Nemuna; et, Neemen; pl, Niemen; ...

. The oldest recorded names of the river are ''Prigora'' (1302), ''Pregor'' (1359), ''Pregoll, Pregel'' (1331), ''Pregill'' (1460). Georg Gerullis connected the name with Lithuanian ''prãgaras'', ''pragorė̃'' ("abyss") and the Lithuanian verb ''gérti'' ("drink"). Vytautas Mažiulis instead derived it from ''spragė́ti'' or ''sprógti'' ("burst") and the suffix -''ara'' ("river").http://journals.lki.lt/actalinguisticalithuanica/article/download/856/947/

Overview

It starts as a

confluence In geography, a confluence (also: ''conflux'') occurs where two or more flowing bodies of water join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main stem); o ...

of the

Instruch The Instruch (russian: Инструч; german: Inster; lt, Įsrutis, Įsra; pl, Wystruć) is a river in Russia's Kaliningrad Oblast. It begins northeast of Dobrovolsk and, along with the river Angrapa, forms the Pregolya near Chernyakhovsk. Prio ...

and the

Angrapa The Angrapa (, , , ) is a river that begins in northeastern Poland and ends in the Kaliningrad Oblast of Russia. Originating in Lake Mamry, it joins the 101-km-long Instruch at a point near Chernyakhovsk – variously assessed as lying 140, 169 ...

and drains into the

Baltic Sea The Baltic Sea is an arm of the Atlantic Ocean that is enclosed by Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Poland, Russia, Sweden and the North and Central European Plain. The sea stretches from 53°N to 66°N latitude and from ...

through the

Vistula Lagoon The Vistula Lagoon ( pl, Zalew Wiślany; russian: Калининградский залив, transliterated: ''Kaliningradskiy Zaliv''; german: Frisches Haff; lt, Aistmarės) is a brackish water lagoon on the Baltic Sea roughly 56 miles (90 ...

. Its length under the name of Pregolya is 123 km, 292 km including the

. The basin has an area of 15,500 km². The average flow is 90 m³/s. Euler's

Seven Bridges of Königsberg The Seven Bridges of Königsberg is a historically notable problem in mathematics. Its negative resolution by Leonhard Euler in 1736 laid the foundations of graph theory and prefigured the idea of topology. The city of Königsberg in Prussia (n ...

problem was based on the bridges crossing the river in

Königsberg Königsberg (, ) was the historic Prussian city that is now Kaliningrad, Russia. Königsberg was founded in 1255 on the site of the ancient Old Prussian settlement ''Twangste'' by the Teutonic Knights during the Northern Crusades, and was named ...

(now

Kaliningrad Kaliningrad ( ; rus, Калининград, p=kəlʲɪnʲɪnˈɡrat, links=y), until 1946 known as Königsberg (; rus, Кёнигсберг, Kyonigsberg, ˈkʲɵnʲɪɡzbɛrk; rus, Короле́вец, Korolevets), is the largest city and ...

Cities and towns

Chernyakhovsk Chernyakhovsk (russian: Черняхо́вск) – known prior to 1946 by its German name of (Old Prussian: Instrāpils, lt, Įsrutis; pl, Wystruć) – is a town in the Kaliningrad Oblast of Russia, where it is the administrative center of ...

Znamensk Znamensk (russian: Знаменск) is the name of several inhabited localities in Russia. ;Urban localities * Znamensk, Astrakhan Oblast, a closed town in Astrakhan Oblast ;Rural localities *Znamensk, Kaliningrad Oblast, a settlement in Znamen ...

Gvardeysk Gvardeysk ( rus, Гварде́йск, p=ɡvɐrˈdʲejsk, a=RU-Gvardejsk.ogg), known prior to 1946 by its German name ( lt, Tepliava; pl, Tapiawa/Tapiewo), is a town and the administrative center of Gvardeysky District in Kaliningrad Oblast, Rus ...

Tributaries

* Pissa * Lava/Łyna *

References

Rivers of Kaliningrad Oblast {{Russia-river-stub

Name

Overview

Cities and towns

Tributaries

See also

References