The calculated distance (air line) between San Juan de la Maguana and Boca Chica is approximately 110 miles respectively 176 kilometers.
By car or train, the actual journey to Boca Chica is certainly longer, as only the direct route (as the crow flies) between San Juan de la Maguana and Boca Chica has been calculated here.
Air line (approximately)
176 kilometers
95 nautical miles