A friend was a Blue Funnel officer. He said the East Float was big, but the big King George V Dock in London, built in the 20s were bigger. I disagreed as I have been to both. The London docks were a white elephant as big ships could not sail up the Thames.
The KGV don't look that big:

The East Float is impressive and I always thought bigger than Gladstone. But Seaforth is bigger, as it was the largest docks in the country when opening in 1972, with the largest dock gates too.
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Gladstone may have more water space between the branches overall, and more quay length, but the East Float is one large impressive expanse of water at its widest.
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