Aerial view of Sydney Harbour, Australia

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It’s quite shallow though. If you need to anchor or berth large ocean-going ships, then [Halifax Harbour]( is unsurpassed.

As [this photo from World War II shows](, you can anchor entire navies safely inside it. Plus it has very steep sides (being fjord rather than an estuary) so it doesn’t need dredging. It’s topography makes it very easy to defend, thanks to McNabs Island at the harbour-mouth, and high bluffs on the approaches. It’s also the eastern-most ice-free port in North America, giving it immense strategic importance.

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