After some reading and some plagiarism, this is what I have come up with and posted on the Red Box Calgary wiki:
Throughout the known world, no city is half so notorious. Blackened by fire, soiled by pestilence, and scarred by war, its sandy collection of spiderwebbed tenements and rat-ridden bazaars have birthed some of the worst rogues and villains to ever stalk the storied thrones of the north.
But Jekarra is also a city of chance and adventure, where fortunes are won in a night and lost before dawn. Where gems glint and flare in the lamplight, the might of magic knows no bounds, and a warrior's quick blade and shirt of mail are his best defense.
So loosen your sword, keep a hand on your coin pouch, and take these first steps into its shadowy, torch-lit streets. A black mist is rolling in off the salt marsh, and the ancient city beckons…
Welcome to Jekarra the Wicked, city of thieves, city of the long night, city of adventure. Rich, poor, religious, debased - all of these and more can be found here. It all depends on where you look.
The idea for Jekkara the Wicked came from Thieves World. For those who are unfamiliar with it, Thieves World was/is a setting developed by the author Robert Asprin for a series of fantasy anthologies. The idea was to create a common, consistent backdrop, then invite a wide variety of authors to write stories using that setting, but exploring their own characters and interests within it.
That is what I am trying to do with Jekkara. I want to develop a very high-level overview of a setting where various Red Box Calgary DM's can set their own adventures. An ancient, sprawling and decadent city with a maze of catacombs and vaults beneath it provides for numerous adventure opportunities.
The name "Jekkara" comes from my love of Leigh Brackett's stories.