The calculated distance (air line) between Fermoy and An Muileann gCearr is approximately 104 miles respectively 167 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 Fermoy and An Muileann gCearr has been calculated here.
Air line (approximately)
167 kilometers
90 nautical miles