Weihai, formerly Weihaiwei, is a prefecture-level city and major seaport city in the easternmost Shandong province of China. It borders Yantai to the west and the Yellow Sea to the east, and is the closest mainland Chinese city to South Korea. Compared with the 2,804,771 people in the 2010 Chinese census, there has been a total increase of 101,777 people over the past decade, an increase of 3.63%, with an average annual growth rate of 0.36%.