Korea (North) is 8.8 times larger than Yantai (China).
Area: 120,538 km2 World Factbook
Population: 24,851,627 (July 2014) World Factbook
North Korea, officially the Democratic People's Republic of Korea, is a country in East Asia, in the northern part of the Korean Peninsula. The name Korea is derived from Goryeo, a dynasty which ruled in the Middle Ages. The capital and largest city is Pyongyang. Wikipedia
Area: 13,639 km2 calculated
Yantai, formerly known as Chefoo or Chih-fou, is a prefecture-level city in northeastern Shandong province, People's Republic of China. Located on the Bohai Strait and the southern coast of the Korea Bay, Yantai borders the cities of Qingdao and Weihai to the southwest and east respectively. Wikipedia