Barry Docks by Friar's point. It had been a port in Medieval times. The island was about long and wide, with a height of above mean sea level. The mainland slopes up to the north, so the sound was well sheltered from the wind. No rivers or streams ran into the sound. The Bristol Channel is known for the range of its tides. During normal spring tides there is a range in water level of , and during normal neap tides a range of but tides can peak at around in which case sea water flows into the dock over the top
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