The calculated distance (air line) between San Gregorio de Nigua and Boca Chica is approximately 32 miles respectively 52 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 Gregorio de Nigua and Boca Chica has been calculated here.
Air line (approximately)
52 kilometers
28 nautical miles