Relief shown by spot heights. Inset: Nan Hai ge dao yu, scale 1:18,000,000. Available also through the Library of Congress Web site as a raster image.
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/2007628294/">https://www.loc.gov/item/2007628294/</a>