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The Texas Gulf Coast is roughly 380 miles but that's on the Gulf side of the barrier island. The you have close to 400 miles of coastline on the back side of that barrier island. And then you have the coastline of Mainland Texas so Texas has 3 Coastlines, not counting all the tidal reaches of rivers. NOAA says 3,359 miles of 'shoreline' but I believe that includes non-tidal, or "Non-Coastal" portions of rivers and lakes.

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