(covers information from several alternate timelines)
Kalto Province was a region on a Class M planet located in the Delta Quadrant. Inhabited by a humanoid race, much about this province was unknown to Humans. Something that was related to this province, be an item or an individual, was called Kalton.
In an alternate timeline, Captain Kathryn Janeway and Tom Paris said they were from Kalto Province as a cover for their real identities. Latika doubted this, as the transport attendant had already assured him that two of the four people arriving from that location on the continental transport were older than them and were accompanied by a child. (VOY: "Time and Again")