For the Geo Quiz, we're zeroing in on China's biggest city.
It looks out over the East China Sea, from about halfway between Beijing and Hong Kong.
An estimated 23 million people live in this mega-city.
23 million plus one: an American woman is planning on taking a job there.
And she's heading for Shanghai. 27-year-old American Tina Sawaya is leaving next year for a new teaching job. She tells anchor Marco Werman that moving to Shanghai is a chance to move beyond juggling part-time teaching jobs and waiting tables to make ends meet in the US.