Barry Docks of leads to the dock basin entrance. The channel has a least depth of , with a depth of at spring tides and at neap tides. At high-water spring tides the depth of water at the entrance to the basin is . At high-water neap tides it is . There are several moorings for yachts and small craft on the west of the tidal basin. The original entrance to the docks is wide, with two wrought-iron gates operated by direct acting hydraulic cylinders. This sea entrance leads into the Basin, (rarely called No.3 dock), that is and covers . At
The Sea and Little Fishes Granny is the sea, and the other witches are the fishes (at one point Nanny says that calling Granny 'full of pride' is like calling the sea 'full of water'; water is what the sea "is"). It is based on the "ancient phrase" "The big sea does not care which way the little fishes swim", which Pratchett made up at some point before the story, and finally used in "Night Watch". The witches appear as supporting characters in the Tiffany Aching stories starting with "The Wee Free Men". "A Hat Full of Sky" further develops the Witch Trials and the