The section of the Midwest and NE thats within roughly 60 miles of the Great Lakes.
Includes: Michigan, North Ohio, NW Indiana, NE Illinois, East Wisconsin, NW Pennsylvania, and West New York. Chicago/Gary, Cleveland/Akron/Youngstown, Detroit, Buffalo, Milwaukee, Toledo, Erie, etc.
"Third coast" likely refers to the idea that the US population tends to be higher on the east and west costs, and that Chicago, lying on the shores of Lake Michigan, is the third largest city in the U.S.
Nestled in the heart of Chicago's Gold Coast at the corner of Dearborn & Goethe is the Third Coast Cafe.
The Third Coast International Audio Festival was created by Chicago Public Radio.
Reason to boast on the 'Third Coast' by Michael Burnham - 3.29.06: The Windy City is home to the nation’s first skyscraper to achieve a Gold Core & Shell rating from the U.S. Green Building Council’s LEED (Leadership in Energy & Environmental Design) program.
"NYC = East Coast, LA = West Coast, Chi = Third Coast"