Priory Wood Nature Reserve contains 11 acres of ancient, broadleaved woodland on the east side of the shallow valley of the
River Usk, 4 miles north of Usk town centre; mostly oak and beech, plus cherry, yew, ash, birch and elm, spread across a relatively steep slope. Access is via a quiet lane off the B4598, and from the entrance, marked by an inconspicuous sign, a half mile path loops through the trees, which allow fleeting views of the wider landscape, across the river towards the hills above Pontypool.
The ancient, undisturbed character of the woods is shown by abundant indicator wildflowers, in particular bluebell, violets, wood sorrel, wild garlic and yellow archangel, blooming between March and May, after which the canopy closes in and other plant life is restricted to shade and moist-tolerant species of ferns, lichens and fungi. Wildlife is mostly limited to insects, which support a population of noctule bats The wood is also a Site of Special Scientific Interest (SSSI).