The Pregolya or Pregola (Russian: Прего́ля; German: Pregel; Lithuanian: Prieglius; Polish: Pregoła) is a river in the Russian Kaliningrad Oblast exclave.

Pregolya
The Pregolya in Gvardeysk.
Location
Country	Russia
Physical characteristics
Source
• location	Instruch and Angrapa confluence
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)

Name

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

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").[1]

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 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).

Cities and towns

• Chernyakhovsk
• Znamensk
• Gvardeysk
• Kaliningrad

Tributaries

• Pissa
• Lava/Łyna
• Angrapa
• Instruch

See also

• List of rivers of Russia
• Bridges of Konigsberg problem

References

This Kaliningrad Oblast location article is a stub. You can help Wikipedia by expanding it.

• v
• t
• e

This article related to a river in Russia is a stub. You can help Wikipedia by expanding it.

• v
• t
• e

На других языках

[de] Pregel

[es] Río Pregolia

[it] Pregel

[ru] Преголя