- Instruch River
The Instruch ( _ru. Инструч; _de. Inster; _lt. Įsrutis) is a
river inRussia 'sKaliningrad Oblast . It develops northeast ofDobrovolsk and, along with theAngrapa River , forms thePregolya nearChernyakhovsk .Prior to 1945, the river was part of German
East Prussia . The town of Insterburg (now Chernyakhovsk) was named after the river's German name, "Inster".
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