Yes, "Southeastern" in "Southeastern US" should be capitalized as it is part of a proper noun.
Oslo is the capital of Norway, located on the southeastern side of Norway close to the border with Sweden. Oslo is both a capital and county.
Vestfold is a tiny little county on the southeastern side of Norway. There are fourteen municipalities within Vestfold. Tonsberg is the administrative center.
You are in the southeastern side of Norway. Right next to Sweden
Telemark is a county in Norway that is located on the southeastern edge of the country. This county has a total 18 municipalities. Skien is the largest and the capital city.
Norway
Norway is still situated in Europe and has not arrived in the US.
Yes it is. It is in the southeastern US, below Georgia.
The Pacific Ocean.
tennessee
southeastern us or gulfcoast
It is a region.