…and thereby hangs our tale
The Doclopedia #1,134
Monsters Of The Circle Sea: The Great Turtle
Far out to sea, where the waters are deeper than deep, lives the Great Turtle, the largest “monster” on the planet. He (or is it she?) is a full mile long and almost that wide, with a sawtooth looking ridge running the length of the shell. The Great Turtle is a medium green all over and has huge yellow eyes.
While some worship the Great Turtle as a god, most people fear it due to it’s sheer size. The tsunamis it generates just coming to the surface too quickly can reach 10 feet in height. The ones created by it’s wake while swimming along can reach five feet or more.
The Great Turtle does not seem to be sentient, but nobody knows for sure. There are reports of it coming to the aid of ships that have been damaged badly or becalmed. In such cases, any rational sailors will later make a very generous offering by dumping valuables into the sea.