The St. Martin River is a tributary of

Isle of Wight Bay Isle of Wight Bay is a lagoon that separates part of mainland Worcester County, Maryland from the midtown part of Ocean City, also in Worcester County. To the north, it connects to the Assawoman Bay just south of the Assawoman Bay Bridge, and to ...

Worcester County, Maryland Worcester County is the easternmost county of the U.S. state of Maryland. As of the 2020 census, the population was 52,460. Its county seat is Snow Hill. It is the only county of Maryland that borders the Atlantic Ocean, and the only county ...

. Approximately long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data
The National Map
accessed April 1, 2011 it drains the northernmost part of Worcester County. A short river, the St. Martin broadens rapidly to enter

where the bay is crossed by

Maryland Route 90 Maryland Route 90 (MD 90) is a state highway in the U.S. state of Maryland. Known as the Ocean City Expressway, the state highway runs from U.S. Route 50 in Maryland, U.S. Route 50 (US 50) near Whaleyville, Maryland, Whaleyville to Maryland R ...

. Most of the river is a tidal

estuary An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environment ...

. Its two main tributaries are the Bishopville Prong and the Shingle Landing Prong. The St. Martin forms the northern boundary of

Ocean Pines, Maryland Ocean Pines is a census-designated place (CDP) in Worcester County, Maryland, United States. The population was 11,710 at the 2010 census. It is part of the Salisbury, Maryland-Delaware Metropolitan Statistical Area. It shares the same ZIP code ...

; Bishopville, Maryland is on the Bishopville Prong of the river.

References

Rivers of Worcester County, Maryland Rivers of Maryland {{Maryland-river-stub