Trewern Round is a walled iron age enclosure c. 500 yards ESE of Trewern Farm. The round measures c. 50 yards in diameter. Its boundary wall, up to 6 feet high, is well preserved with two entrances at the NW and SE. There are extended trackways from each entrance. When I visited (30.04.17) the interior of the enclosure was overgrown so it was not possible to discern any internal features.
Trewern Round is listed as Historic England 1004314 (go to Links).