The Bluerose Sea was situated in northeastern Lether. The Sea's name came from a sapphire-coloured mineral, intricate as roses, which 'grew' in the caves that were prevalent in the mountains which bordered the Sea.
Crocodiles were found along the sea's muddy southern shoreline.
The waters off the Awl'dan coast were a deadly maelstrom of violent waves and strong winds that no trader ship would willingly enter. Eighty years before the events of the Malazan Book of the Fallen, these waters had pulled an entire Meckros floating city into the depths, drowning its twenty thousand inhabitants.
The sea was a bountiful source of cod for the nations on its coast.