The calculated distance (air line) between Nishinomiya-hama and Ōtsu is approximately 36 miles respectively 58 kilometers.
By car or train, the actual journey to Ōtsu is certainly longer, as only the direct route (as the crow flies) between Nishinomiya-hama and Ōtsu has been calculated here.
Air line (approximately)
58 kilometers
31 nautical miles