Question: Many descendants from what directional region of Iceland are featured in literature from Iceland's "Saga Age"?

Context paragraphs:
Sauðafell Raid: The Sauðafell raid (Icelandic or Sauðafellsferð) in January 1229 was one of the signal events in the increasing disorder that affected medieval Iceland during the period of violent struggle between rival elites known as the Age of the Sturlungs.  Sturla Sighvatsson had supported the sons of Hrafn Sveinbjarnarson when they killed the rapacious chieftain Þorvaldr Snorrason of Vatnsfjörður at the burning of Gillastaðir in Króksfjörður in 1228.  Þórðr and Snorri, Þorvaldr's sons, sought vengeance, and it was rumoured that it was Snorri Sturluson who encouraged them to direct their anger against Sturla, his own nephew, who was also his principal rival for power in the west of Iceland.  During the winter after the burning of Þorvaldr the brothers rode by night to Sauðafell in the Dalir region, where Sturla lived, only to find that he was not at home.  They broke into the farm and ransacked it, killing or wounding several of the inhabitants.  After threatening Solveig Sæmundardóttir, Sturla's wife, in her bedchamber, they departed with all the booty they could carry.  The account of the raid in Íslendinga saga indicates that it was considered a great scandal by many contemporary Icelanders, not least because of Snorri's involvement.

Einar Pálsson: Einar Pálsson (1925–1996) was an Icelandic writer.  He was born in Reykjavík, Iceland.  He is best known for his theories about the origin of the Icelandic Saga literature as relict mythology of pagan ritual landscapes.  He acquired a cand.  phil.  degree in 1946, and a BA degree in English and Danish in 1957 (University of Iceland).  He graduated from The Royal Academy of Dramatic Art in London in 1948.  In 1995 he was awarded The Knight’s Cross of the Order of the Falcon by the president of Iceland as recognition of his research into Old Icelandic literature.  In 1969 he put forward his theories about the roots of Icelandic culture and developed them further in a series of 11 books.  His theories can be grouped into four categories:

Thor Philip Axel Jensen: Thor Philip Axel Jensen (3 December 1863 – 12 September 1947) was a Danish entrepreneur who moved to Iceland at an early age and became famous there for his business activities during the first half of the twentieth century: he all but introduced big business, and even modern capitalism, to the country.  His company Kveldúlfur hf.  was the biggest in Iceland during the inter-war years.  His descendants include some of Iceland's most powerful and well known figures.

Eyrbyggja saga: Eyrbyggja saga (] ) is one of the Icelanders' sagas; its title can be translated as "The Saga of the People of Eyri."  It was written by an anonymous writer, who describes a long-standing feud between Snorri Goði and Arnkel Goði, two strong chieftains within the Norse community that settled in Iceland.  The title is slightly misleading as it deals also with the clans from Þórsnes and Alptafjörðr on Iceland.  The most central character is Snorri Þorgrímsson, referred to as Snorri goði and Snorri the Priest.  Snorri was the nephew of the hero of Gísla saga, and is also featured prominently in "Njáls saga" and "Laxdœla saga".  Another main interest of the "Eyrbyggja Saga" is to trace a few key families as they settled Iceland, specifically around the Snæfellsnes peninsula.

Gunnars þáttr Þiðrandabana: Gunnars þáttr Þiðrandabana ("The Short Saga of Gunnar, Thidrandi's Killer") is a short saga (or þáttr) written in Old Norse in medieval Iceland.  The events of the story take place in the Viking Age and concern Gunnar, a Norwegian merchant, who avenges his host's death in Iceland's Eastern Region, and must elude his enemies until he can safely escape the country.

Kristni saga: Kristni saga (the book of Christianity) is an Old Norse account of the christianisation of Iceland in the 10th century and of some later church history.  It was probably written in the early or mid-13th century, as it is dependent on the Latin biography of King Olaf Tryggvason written by the monk Gunnlaugr Leifsson around the last decade of the 12th century.  This results in Latinate forms of some names.  The author also used work by Ari Þorgilsson, probably the now lost longer version of the "Íslendingabók", and "Laxdæla saga".  Based on the region of Iceland with which the text indicates the greatest familiarity, it was probably not written at Skálholt.

Atla saga Ótryggssonar: Atla saga Ótryggssonar is a relatively young text in the genre of sagas of Icelanders, most probably written in the 19th century.  It takes place in Norway and Iceland during the age of the settlement of Iceland (10th century); the main character Atle grew up as a "kolbítr" (ash lad), but when he comes to age, he avenges the murder of his father and emigrates to Iceland.  The oldest known manuscript with this text is from 1820, where it is written down in a manuscript together with other, elder saga texts.

Sagas of Icelanders: The Sagas of Icelanders (Icelandic: "Íslendingasögur" ), also known as family sagas, are prose narratives mostly based on historical events that mostly took place in Iceland in the 9th, 10th, and early 11th centuries, during the so-called Saga Age.  They are the best-known specimens of Icelandic literature.

Saga Age: The Saga Age is the period in Icelandic history during which the majority of the sagas of Icelanders are set.  It runs from the settlement of Iceland in 870 until about 1056 when the first bishop in Iceland founded a church at Skálaholt.

Njarðvík (farm): Njarðvík (farm) or Njardvik (farm) is an ancient farm in northeast Iceland.  The descendants of its settlers are featured in several of the Sagas of Icelanders.

Supporting paragraphs: Njarðvík (farm) Sagas of Icelanders
Answer: northeast Iceland