World Map 30 X 32 Puzzle - 1 Million Cities starting with a vowel
Type a city, starting with a vowel (A-E-I-O-U-Y), whose urban agglomeration holds at least 1 million people: its piece and the ones next to it appear. Pieces that aren't reached by any city are shown at the start.
List of cities taken from citypopulation.de - to learn the 250 largest ones try this quiz
A big thanks to Quizzer6794 for teaching me how to avoid horizontal gaps between pieces, eg see his US State Picture Puzzle Game #3... does anyone know how to remove vertical lines too?!