The St. Martin River is a tributary of Isle of Wight Bay in Worcester County, Maryland. 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 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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