The calculated distance (air line) between An Ros and An Muileann gCearr is approximately 51 miles respectively 82 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 An Ros and An Muileann gCearr has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles