Pregolya

"Pregola" redirects here. For the Italian municipality, seeBrallo di Pregola.

Pregolya
The Pregolya inGvardeysk.
Location
Country	Russia
Physical characteristics
Source
• location	InstruchandAngrapaconfluence
Mouth
• location	Vistula Lagoon,Baltic Sea
• coordinates	54.6827°N 20.3778°E/54.6827; 20.3778
Basin size	15,500 km2(6,000 sq mi)
Discharge
• average	90 m3/s (3,200 cu ft/s)

ThePregolyaorPregola(Russian:Преголя;German:Pregel;Lithuanian:Prieglius;Polish:Pregoła) is ariverin theRussianKaliningrad Oblastexclave.

Name

A possible ancient name byPtolemyof the Pregolya River is Chronos (from Germanic *hrauna,"stony" ),although other theories identify Chronos as a much larger river, theNemunas.

The oldest recorded names of the river arePrigora(1302),Pregor(1359),Pregoll, Pregel(1331),Pregill(1460). Georg Gerullis connected the name with Lithuanianprãgaras,pragorė̃( "abyss" ) and the Lithuanian verbgérti( "drink" ). Vytautas Mažiulis instead derived it fromspragė́tiorsprógti( "burst" ) and the suffix -ara( "river" ).

Overview

It starts as aconfluenceof theInstruchand theAngrapaand drains into theBaltic Seathrough theVistula Lagoon.Its length under the name of Pregolya is 123 km, 292 km including theAngrapa.Thebasinhas an area of 15,500 km².The average flow is 90 m³/s.

Euler'sSeven Bridges of Königsbergproblem was based on the bridges crossing the river inKönigsberg(nowKaliningrad).

Cities and towns

• Chernyakhovsk
• Znamensk
• Gvardeysk
• Kaliningrad

Tributaries

• Pissa
• Lava/Łyna
• Angrapa
• Instruch

See also

• List of rivers of Russia
• Bridges of Konigsberg problem