DAHL — …Oddly enough, the best-known aspect of this sector is Billibotton, a semilegendary place about which innumerable tales have grown up. In fact, a whole branch of literature now exists in which heroes and adventurers (and victims) must dare the dangers of passing through Billibotton. So stylized have these stories become that the one well-known and, presumably, authentic tale involving such a passage, that of Hari Seldon and Dors Venabili, has come to seem fantastic simply by association… (Prelude to Foundation)...
Dahl is a sector of Trantor.
About Dahl[]
Hari Seldon first encountered it during the event known as The Flight. It is a small and rather down-trodden sector, which does not necessarily seem politically ambitious. Dahlites, as the residents of the sector are called, have a mythical belief that they come from the original single planet inhabited by humans.
Dahlite men have a tendency to wear thick, black mustaches, which they prize as they do their honor. Despite the ban on illegal weapons in all of Trantor, most Dahlites carry knives are are adept at using them.
Dahl is infamous for its Billibotton Sector, a slum area where crime is rampant. It is in this area that Hari Seldon and Dors Venabili found their adopted son, Raych Seldon.
One of the many prominent features of Dahl are its heat-sinks, which are an important source of energy for the empire. An entire class of Dahlites, called heat-sinkers, work underground near these heat sinks, and are often shunned by higher-class Dahlites as inferior. Yugo Amaryl, who was perhaps the second most important person in the development of psychohistory, was a native heat-sinker on Dahl before meeting Hari Seldon during the latter's flight from the Emperor Cleon I.