What is the name of the Viking settlement area in England?

The story behind the answer

It denotes the swath of northern and eastern England placed under Scandinavian rule and "Danish law" after 9th-century Viking invasions. Following Alfred the Great’s victory over Guthrum, treaties fixed a frontier dividing Anglo-Saxon Wessex from Norse-held lands. The zone included York, East Anglia, and the Five Boroughs, where distinct legal customs, taxation, and governance prevailed.

Its imprint is still visible: place-names ending in -by, -thorpe, and -thwaite, and many Norse loanwords in English (sky, egg, window). Local assemblies called things met to settle disputes, and trade tied these towns to the wider North Sea world. English kings like Edward the Elder and Athelstan gradually reconquered the region, but the Scandinavian cultural and legal legacy endured well into the Middle Ages.