Harn is part of a larger world known as Kethira. The island of Harn lies off of the western shore of the continent of Lythia which is home to many cultures (mostly human dominated). Ivinia was the first of these to be develop back in the 80s. It is Harn's equivalent of Scandinavia and home to several viking kingdoms.
Columbia Games re-edited, and re-formatted the original Ivina module and it has been released. Like most Harn product it is pricey but the quality is top notch. One big change is that each Ivinian realm now has a page devoted to it compared to the original.