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In page Dejima:

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On the administrative level, the island of Dejima was part of the city of Nagasaki. The 25 local Japanese families who owned the land received an annual rent from the Dutch. Dejima was a small island, 120 metres (390 ft) by 75 metres (246 ft),[1] linked to the mainland by a small bridge, guarded on both sides, and with a gate on the Dutch side. It contained houses for about twenty Dutchmen, warehouses, and accommodation for Japanese officials.[citation needed]