Sea of Dreams
Dragonborn are often mistaken for Rikoshi, a fact both races resent tremendously. This resentment does lead to tension between the races, and they rarely travel together for long.
The dragonborn homeworld is also generally regarded as the dragon homeworld. Once a dragon reaches its full maturity it is able to use its knowledge of magic to travel the Lanes much like a Spelljammer. In this way, according to historians, dragons were able to leave their homeworld and populate other planets. Dragonborn, however, can not travel in this way. In order to follow their clan-leaders and traditions they quickly developed ways to follow their elders and soon encountered the other species. By and large Dragonborn are accepted everywhere, but their rarity does make their arrival a bit of an event in smaller settlements.