Sabine River Syllabification: (Sa·bine Riv·er)Pronunciation: /səˈbēn/Entry from US DictionaryDefinition of Sabine River a river that flows for 360 miles (580 km) from eastern Texas to form the border with Louisiana and reaches the Gulf of Mexico at Sabine Pass. Sabine River in other Oxford dictionaries Definition of Sabine River in the US English dictionary