The most populous of Álengiamark's seven fylke, Sudervik is the historic core of the country. It borders Wampanoagmark and Margirhaedeyja fylke and has international borders with Passamaquoddia and Kanienmark. The population is almost 3.5 million and the capital is Nahigavik.
Once inhabited by native Leifians, or 'Suderfolk' as the early Vinlanders called them, the Sudervik was quickly identified as good farmland by the early Norse settlers of Leifia. As the original settlements on Vinland(the island) expanded fresh land was required and farms began to spring up on the islands of Rauðreyja, Gráakonenna and Ílaekjurland. The towns of Nýflói on Rauðreyja and Aquwashinni on Ílaekjurland vie for the title of oldest Álengsk settlements. However in 1119 the Wampanoag tribe destroyed the Norse farms along the coast and on the islands. An army was swiftly organised defeating the Wampanoags and securing various parcels of lands for Norse settlement. Again in 1127 however they would be forced to abandon the farms during the Second Wampanoag War. Branded a 'crusade' it attracted European attention and help from several Leifian tribes. The Wampanoags' defeat would create the core territory of Álengiamark and help portion out the country between lords both Norse and native Leifian, whilst St. Hafdiss was built in the centre as the land, and crown's, new capital.
For the majority of the next six centuries the Sudervik would be divided up between the earls, the Royal Domain centred on St. Hafdiss, independent abbies and independent cities, all competing for wealth and prestige and paying little heed to the slow wasting away of the crown's power.
By the mid-1700s the various small entities which would come to make up Sudervik had largely run out of political steam. Their small economies could not hope to compete with the larger nation-states of Leifia or with the trading powers of Europe. Under the aegis of Queen Herridr I the country was reshaped into a coherent whole and Sudervik was created out combining the Royal Domain with Quiripiland, Moheganland and the old earldom of Sudervik. Agreements with the abbies and independent cities would follow in time.Now working in co-operation rather than competition the whole region would soon boom and lead the way in industralisation. Textile manufacturing, silverware and shipbuilding are major industries. It is estimated that 30% of the entire shipping fleet of Eastern Leifia was built in the boatyards of Sudervik.
In the 1940s and 50s a wave of anarchism struck Sudervik, aimed at creating a seaprate homeland for the large Wampanoag minority. Whilst politicians rejected and cracked down on the extremist factions working with more peaceful minded Wampanoag leaders would lead to a fylk-wide plebiscite. Any county voting for separation were transferred in 1962 to the newly created autonomous Wampanoagmark. The result of which significantly pacified the long-contentious issue. This did not stop cession movements however, chief among them is the potential separation of St. Hafdiss, Álengiamark's capital and Sudervik's largest city, off into its own 'capital' fylk.