What is the name of the region located just south of the Arctic?

Northern Temperate Zone.

Explanation:

The region north of this circle is known as the Arctic, and the zone just to the south is called the Northern Temperate Zone.

Explanation:

“Arctic” comes from the work “arktikos”, the Greek word for bear. The reason is that Ursa Major, the Great Bear constellation is viewed in the northern sky. The Arctic Circle marks the region above which, for at least 1 day a year, there is all day sunshine in the summer and 24-hours of darkness in the winter.