The St. Martin River[1] is a tributary of Isle of Wight Bay in Worcester County, Maryland. Approximately 4.4 miles (7.1 km) long,[2] it drains the northernmost part of Worcester County.
A short river, the St. Martin broadens rapidly to enter Isle of Wight Bay where the bay is crossed by Maryland Route 90. Most of the river is a tidal estuary. Its two main tributaries are the Bishopville Prong and the Shingle Landing Prong.
The St. Martin forms the northern boundary of Ocean Pines, Maryland; Bishopville, Maryland is on the Bishopville Prong of the river.
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38°24′10″N 75°8′30″W / 38.40278°N 75.14167°W