Place · river

Pregolya

Also known as Pregel

The Pregolya is a river in Russia's Kaliningrad Oblast, formed by the junction of the Instruch and the Angrapa and flowing about 123 km west to the Vistula Lagoon. Kaliningrad, formerly Königsberg, stands on its banks, and it was the main waterway of historic Prussia. The bridges over its branches in Königsberg inspired Leonhard Euler's problem of the Seven Bridges in 1736, a founding work of graph theory.

Pregolya
Image: CC BY 1.0 · Wikimedia Commons

Mentioned in 1 state history

Natangians

See also

Cite this entry
APA
The Epoch Institute. (2026). Pregolya. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/pregolya
MLA
“Pregolya.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/pregolya. Accessed .
Chicago
The Epoch Institute. “Pregolya.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/pregolya.
Harvard
The Epoch Institute (2026) ‘Pregolya’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/pregolya (Accessed: ).

Last reviewed October 2026Random entry ↻