Allt Rhongyr is within the Brecon Beacons National Park, adjacent to Craig y Rhiwarth Nature Reserve and offers dramatic views of the Tawe Valley. It features a diverse mix of limestone grassland, acidic grassland and woodland and it was once the site of an iron age hillfort. The site is now managed by grazing under an agri-environment scheme.
The Pen y Waun nature reserve consists of two small fields situated on the edge of Waun-y-Mynach common. The fields were former garden plots for nearby cottages.