The Poisoned Glen (Irish: Cró Nimhe)[1] is a glen or valley located near Dunlewey in Gweedore, a district in the north-west of County Donegal, Ireland. It is located beside Errigal and extends beyond Glenveagh National Park, facing Loch Altan.[2] The Poisoned Glen is situated approximately 40 kilometres (25 mi) from Letterkenny. The Cronaniv Burn flows through the glen.[3][4]