These maps were drawn by cartographer Isaac de Graaf around 1695, based on originals from the mid 1600s. On the top left is the Keelung area; on the right is the Bay of Tayouan and its environs, including Saccam. Image used by permission of the Dutch National Archive, The Hague, Netherland (finding aid: VEL: 305).
<bdi><a href="https://en.wikipedia.org/wiki/en:Isaak_de_Graaf" class="extiw" title="w:en:Isaak de Graaf"><span title="Dutch cartographer">Isaak de Graaf</span></a>
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Dutch Nationaalarchief, VEL 305