From the UNESCO Advisory Body Evaluation:
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River. Its location in the middle of the river made it a
strategic place to control the waterway. The original
structures comprise: the fort itself, the slave house, the
governor's kitchen, the blacksmith shop, and a store. All of
these are in ruins. The fort is situated in the middle of this
low island, and is vulnerable to flooding by the tidal
waters. It is roughly square in plan, with polygonal
bastions at the four corners, chamfered at their apexes to
reduce the overall spread of the building and to avoid
having to build on the shore below high-water mark. There
were formerly curtain walls between the north and east
bastions rising to the same height; a large stone cistern for
collecting rainwater was built up against the outside face of
the curtain wall. Traces of ancillary fortifications and
service buildings survive at each end of the island, and on
the southern shore.