The Smyrna River is a river, approximately 15 mi (24 km) long, in central Delaware in the United States. It rises in northwestern Kent County, approximately 3 mi (5 km) northwest of Kenton, and flows generally ENE, past Smyrna and forming the boundary between Kent and New Castle counties. It enters Delaware Bay approximately 6 mi (10 km) northeast of Smyrna. It is navigable for the lower 10 mi (16 km) of its course. The area around and south the Smyrna River is characterized by some of the largest farms in Kent County. Expansive farm fields, interspersed with forest, predominate in this segment. South of the Woodland Beach areas is the lands of the Bombay Hook National Wildlife Refuge.