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The shape of one of the bastions of the walled city of Ternate is clearly visible in a detailed Dutch map of 1916, it could be the bulwark on the west land side, probably named by the Spaniards San Juan. (“Schetskaart van de eilanden Ternate en Hiri” Schaal: 1:20.000 Topographische inrichting in Nederlandsch-Indië , 1916)
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