Qingdao (China) is 16 times larger than Columbus, Ohio.
Area: 694 km2 calculated
Columbus is the capital of and the largest city in the U.S. state of Ohio. It is the 15th largest city in the United States with a population of 822,553. It is the core city of the Columbus, OH Metropolitan Statistical Area, which encompasses a ten county area. Wikipedia
Area: 10,965 km2 calculated
Qingdao is a major city in eastern Shandong Province, Eastern China. Administered at the sub-provincial level, Qingdao has jurisdiction over 7 districts and 5 county-level cities. Wikipedia