Gulf Intracoastal Waterway
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The Gulf Intracoastal Waterway (GIWW) is the portion of the Intracoastal Waterway located along the Gulf Coast of the United States. It is a navigable inland waterway running approximately 1,300 mi (2,100 km) from Saint Marks, Florida, to Brownsville, Texas.
Leland Bowman Lock near Intracoastal City, Louisiana, on the Gulf Intracoastal Waterway
The Corps of Engineers marks the Intracoastal with channel markers like this one.
The Gulf Intracoastal Waterway enters Galveston Bay at Port Bolivar, Texas
Confluence
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In geography, a confluence occurs where two or more watercourses join to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river ; or where two streams meet to become the source of a river of a new name ; or where two separated channels of a river rejoin at the downstream end.
Confluence of the Bhagirathi and Alaknanda Rivers to produce the Ganges at Devprayag, India
The same confluence viewed from upstream at a different time; note the swirl of sediment from the Alaknanda.
The fountain at Point State Park in Pittsburgh, at the apex of the confluence of the Allegheny (top) and the Monongahela
The White Nile and Blue Nile merge at Khartoum; April 2013 satellite view