Instruch River

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Instruch
Location
CountryRussia
Physical characteristics
Mouth 
 ⁃ location
Pregolya
 ⁃ coordinates
54°38′52″N 21°47′27″E / 54.64778°N 21.79083°E / 54.64778; 21.79083Coordinates: 54°38′52″N 21°47′27″E / 54.64778°N 21.79083°E / 54.64778; 21.79083
Basin features
ProgressionPregolyaBaltic Sea

The Instruch (Russian: Инструч; German: Inster; Lithuanian: Įsrutis, Įsra; Polish: Wystruć) is a river in Russia's Kaliningrad Oblast. It begins northeast of Dobrovolsk and, along with the Angrapa River, forms the Pregolya near Chernyakhovsk.

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.