A Complete List of the Warrens
The Elder Warrens
Starvald Demelain: The Eleint Warren, The First Warren
Kurald Galain: Elder Warren of Darkness
Kurald Thyrllan: Elder Warren of Light
Kurald Emurlahn: Elder Warren of Shadow, the Shattered Warren
Ahkrast Korvalain : Elder Warren of Forkrul Assail
Omtose Phellack: Elder Jaghut Warren of Ice
Tellann: Elder Imass Warren of Fire
as-yet-unnamed Elder Warren of the Sea
The Warren of Chaos
The Beast Hold?
Toblakai Warren
The Paths, warrens accessible by humans
Thyr: The Path of Light
Denul: The Path of Healing
Hood's Path: The Path of Death
Serc: The Path of the Sky
Meanas: The Path of Shadow and Illusion
D'riss: The Path of the Earth
Ruse: The Path of the Sea
Rashan: The Path of Darkness
Mockra: The Path of the Mind
Telas: The Path of Fire
Tennes: The Path of the Land
Oddities
The Forgotten Warren - Barghast Warren
Aral Gamelon: mentioned in MoI as a warren of demons
Kurald Liosan: mentioned in BH, homeworld of the Liosan?
The Empty Hold: accessible by the human mages of Lether
The Imperial Warren: the ravaged surface of Jacuruku made into a warren by K'rul, used by the Malazan Empire for the purposes of travel.
Magic and the Warrens