The calculated distance (air line) between As Samawah and Ar Rumaythah is approximately 15 miles respectively 23 kilometers.
By car or train, the actual journey to Ar Rumaythah is certainly longer, as only the direct route (as the crow flies) between As Samawah and Ar Rumaythah has been calculated here.
Air line (approximately)
23 kilometers
13 nautical miles