This nature reserve is one of the few areas where native woodland can be found. It comprises of two parts, Pease Burn and Tower Burn.
Pease Dean Nature Reserve supports moss and liverwort species, and the best time of year to visit is between April and July.
Pease Burn is a steeply wooded reserve situated immediately above Pease Bay, with two distinct arms, one following the Pease Burn, the other to Tower Burn.
The area nearest the sea is an open valley with grassland, gorse, and alder beside the Pease Burn. Upstream from where the two burns merge, the valleys become steeper and in some parts much more wooded.
Tower Burn has extensive areas of mixed conifer and broadleaved woodland, which are open enough to support an attractive ground flora, particularly primroses.
There are paths throughout the reserve, including the end of the Southern Upland Way.