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 river Angrapa, forms the Pregolya near Chernyakhovsk.
| Instruch | |
|---|---|
 | |
| Location | |
| Country | Russia |
| Physical characteristics | |
| Mouth | |
• location | Pregolya |
• coordinates | 54°38′52″N 21°47′27″E / 54.64778°N 21.79083°E |
| Basin features | |
| Progression | Pregolya→ Baltic Sea |
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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