At almost 250 Ha, Ballynahone Bog is one of the two largest intact, lowland, active raised bogs in Northern Ireland, and considered to be one of the best examples in the United Kingdom. Vegetation communities vary from poor fen, through grassland and heath, to extensive areas of scrub and young woodland.
Species occurring on the site include a number of scarce species such as bog- rosemary and has one of the largest known colonies in the country of the large heath butterfly. Breeding curlew and snipe, wintering hen harrier and merlin are among the birds that can be seen.