From Longman Dictionary of Contemporary Englishsoutheasternsouth‧east‧ern /ˌsaʊθˈiːstən $ -ərn/ adjective (written abbreviation SE) SGin or from the southeast part of a country or area southeastern Europe
Examples from the Corpus
southeastern• Jance's series features a sheriff named Joanna Brady, who works in southeastern Arizona.• Williams lives in Portal in extreme southeastern Arizona.• The fugitive slave problem on the southeastern frontier dated back to the colonial period.• But on April 19,1803 a spectacular display was observed in the southeastern United States.• Sort of a southeastern version of Coyote in the Roadrunner cartoons. 