The calculated distance (air line) between Donnycarney and An Muileann gCearr is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to An Muileann gCearr is certainly longer, as only the direct route (as the crow flies) between Donnycarney and An Muileann gCearr has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles