Pregolya

 ( Rivers Of Kaliningrad Oblast ) 

The Pregolya or Pregola (; ; ; ) is a river in the Kaliningrad Oblast exclave.

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

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").

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Overview It starts as a confluence of the Instruch and the Angrapa and drains into the Baltic Sea through the Vistula Lagoon. Its length under the name of Pregolya is 123 km, 292 km including the Angrapa. The drainage basin has an area of 15,500 km². The average flow is 90 m³/s.

Euler's Seven Bridges of Königsberg problem was based on the bridges crossing the river in Königsberg (now Kaliningrad).

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Cities and towns

• Chernyakhovsk
• Znamensk
• Gvardeysk
• Kaliningrad

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Tributaries

• Pissa
• Lava/Łyna
• Angrapa
• Instruch

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See also

• List of rivers of Russia
• Bridges of Konigsberg problem

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