Charts. Shantung. North coast of Shantung, Chefoo to Weihaiwei, including Chefoo or Yentai Harbor, from British surveys between 1860 and 1902, with additions from survey by Chinese Maritime Customs in 1918; with inset, Chefoo (Yentai) inner harbor, from survey by Chinese Maritime Customs in 1918; chart 2307.Natural scale 1:72,877 at lat 37° 30'.