The River Dulnain (Gaelic: Tuilnean / Abhainn Tuilnein) is a major left bank tributary of the River Spey in northeast Scotland.
It rises in the eastern part of the Monadhliath Mountains (57°09′06″N 4°07′44″W / 57.1516°N 4.1288°W / 57.1516; -4.1288 (River Dulnain (source))) and flows in a generally northeastward direction through uninhabited country to Sluggan, where it is crossed by Sluggan Bridge, constructed by General Wade to carry a military road.
The final section flowing east-northeast to the village of Dulnain Bridge is accompanied by the A938 road.
The river empties into the Spey (57°17′37″N 3°39′14″W / 57.2936°N 3.6538°W / 57.2936; -3.6538 (River Dulnain (mouth))) after passing beneath the A95 road and the disused bridge of the former Strathspey railway.
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