There are also magical methods of transportation. The physical manifestations are in the form of portals and these are quite rare. Some of the more powerful mages are also able to conjure portals at will.
Notable mounts Edit
In the game, Triss uses a teleportation spell when she leaves Kaer Morhen and there is also the suggestion that she was able to transport herself and Geralt from the swamp to her place in the Trade Quarter.