What are the dimensions of an average iceberg?

There is a huge difference bewteen icebergs in the northern hemisphere and those of the southern hemisphere. In Antarctica you get tabular icebergs which are chunks broken off ice shelves rather than the northern hemisphere bergs which are chunks broken off glaciers. What would be considered a large iceberg in the north Atlantic would be considered small or medium in the Southern Ocean where many bergs are kilometres in length. I sailed past one near Casey Station and it took nearly an hour at 10knots to go from one end to the other and that was nowhere near the largest down there.