Coire Bhronn is a west-facing corrie, cut into the ridge between Carn Liath and An Gheal-charn, and overlooking Bynack Lodge.
As a place name Coire Bhronn is obscure - Watson & Allan (1984) is contradictory ; (for the burn) they give Allt Bhronn meaning - burn of bulges ; (for the corrie) they give Coire a' Bhrothain meaning - corrie of the sultry heat. I'm inclined towards the 'bulges' meaning ; unlike the concave corries of the Cairngorms, the sides of this corrie are formed of several convex 'bulges'.
Coire Bhronn historically gave its name (often appearing in the form Corryvron) to the whole south-western corner of Mar Forest, and the earliest reference I’ve found to this locality is in GD124/17/75 a draft lease of 1696 – which contains :
… to pasture 100 head of goods and 8 mares on water of Die or Geldie within forest of Corrivran, as forester of said Earl shall appoint, and to build a sheiling in said forest, for term of 19 years
Although only a draft – this document shows that the commercial grazing in the forest was at least being considered during the time of the Earls of Mar, and that the 'forest of Corrivran' as an entity included Gleann Gheallaidh.
It’s certain that Corryvron was a traditional summer grazing area. From at least the late 18th century the area was included with the rent of the Gleann Dhé farms until the lease of Charles McHardy (the last independent tenant) expired in 1829. From that time the only people living in this part of Mar Forest were employees – shown in census of 1841 as male servants, and in the census of 1851 as Keepers.
From 1830 Corryvron appears to have been set aside for commercial grazing leased on 5 year terms until 1855 – the last commercial grazing tenant was George Clark. Apparently then, by the early 1840s all but this south-western corner of the forest was set aside for shooting, and the emphasis changed – for a while at least – to renting Mar Forest for that use. As early as the 1830s some part of the forest including Gleann Dhé was rented to James Duff. By the early 1840s the old forest, apparently including Corryvron, and Mar Lodge was rented to the Duke of Leeds.