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Krull is a large island at the Rim of the Disc. It has a mountain slightly overhanging the Edge of the Disc. Due to this geographical advantage, many Krullians are astrozoologists, scientists who observe Great A'Tuin the world turtle and the four giant elephants. Krull is ruled by the Arch-Astronomer, has its own magical university and doesn't interact much with the other countries.

Once, Krull has lowered a vessel on a rope over the Edge to observe Great A'Tuin. Another time, Krull constructed a vessel, The Potent Voyager, that is launched rather than attached by a rope. This vessel got misappropriated by certain adventurers, and no further advancement on astrozoology has been reported; but then, few people in other countries are interested in astrozoology in as much detail as the Krullians study it, so maybe there have been advances, they are just not reported on the main continents.

Krull constructed the Circumfence, a sturdy wood-stakes-and-ropes barrier running almost a third of the way around the Edge of the Disc. Hapless ships and vessels continuously get washed toward the Edge, and by means of the Circumfence, Krullians are able to salvage many useful things; for example, many houses are constructed from parts of ships. In the old days, people who ran into the Circumfence would get captured by the Krullian navies and serve as slaves or even honoured guests, at least for a few blissful carefree days... (see The Colour of Magic). Nowadays, Krullians rescue these people and charge them heavy salvage rates, a much more peaceful but just as profitable use of the barrier (see The Last Hero).

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Is there a link here to the big fantasy film of 1983, Krull, which while it received, at best, a lukewarm reception, featured an incompetent and cowardly wizard called Ergo the Magnificent? (Played by the much under-rated British character actor and comedian David Battley[1], who is, alas, no longer with us).

Interestingly enough, Krull and The Colour of Magic were both released in the same year - 1983. One of those strange co-incidences?