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Pregolya
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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|basin]] has an area of 15,500 km<sup>2</sup>. The average flow is 90 m<sup>3</sup>/s. Euler's [[Seven Bridges of Königsberg]] problem was based on the bridges crossing the river in [[Königsberg]] (now [[Kaliningrad]]).
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