Talking about a megalopolis, "Houston" is a giant sprawl of city and 'burbs that stretches from Sealy in the west to Beaumont in the east (about the same as distance New York, NY to Wilmington, DE); from Galveston in the south to Huntsville in the north (about the same distance as Boston, MA to New Haven, CT).

More accurately, Houston is a Mega-flat-hot-olis, since the entire region has the elevation of a pancake and is steamier than a sauna.