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"Dredge has become a vital artery in the construction of Ember and the survival of the Accord." 
Nothing has been confirmed about Ember, except that it's not a "thing".
It is speculated that it is a "place", specifically an underground city. It could very well be a reference to the book 'City of Ember' by Jeanne DuPrau (which was an underground city designed to outlast a world-ending nuclear holocaust).
Its name can also be found on the flight schedule boards at various POIs.