Invereshie and Inshriach (Scottish Gaelic: Inbhir Fheisidh agus Na h-Innse Riabhaich)[3] is a national nature reserve on the western flank of the Cairngorms in the Highland council area of Scotland.

[8] The forest consists chiefly of Scots pine, with scattered examples of rowan, birch, aspen, alder, juniper and holly.

The forest floor hosts a wide array of plants, including heather, blaeberry and cowberry, and many species of mosses, lichens and fungi.

[9][10] Wood ants form an important part of the ecosystem of the Caledonian Forest, which also supports a wide range of other invertebrate life.

Although humans are known to have lived in the area since at least the Bronze Age, until around the mid-18th century the forest remained largely intact, with only small-scale felling of trees for domestic use and localised rough grazing.

From 1780, the Invereshie estate was managed by Captain John Macpherson (1751 - 1799, firstly on behalf of his father George (1702 - 1795), and then his older brother William (1733 - 1812).

The subsequent increase in deer numbers, alongside management practices such as muirburn (the burning of patches of heather to create habitats for grouse) led to a reduction in natural regeneration of the native woodland.

During the 1960s and 70s Inshriach was managed mainly for commercial forestry, and non-native species such as sitka spruce and lodgepole pine were planted in the area.

[19] In addition to being a national nature reserve (NNR), Invereshie and Inshriach lies within a number of other protected areas of Scotland.

[23] The Invereshie and Inshriach NNR is classified as a Category IV protected area by the International Union for Conservation of Nature.