The calculated distance (air line) between Mount Merrion and Cluain Meala is approximately 90 miles respectively 145 kilometers.
By car or train, the actual journey to Cluain Meala is certainly longer, as only the direct route (as the crow flies) between Mount Merrion and Cluain Meala has been calculated here.
Air line (approximately)
145 kilometers
78 nautical miles