From Longman Dictionary of Contemporary Englishsoutheastwardssouth‧east‧wards /saʊθˈiːstwədz $ -wərdz/ adverb (also southeastward /-wəd $ -wərd/) SGtowards the southeast —southeastward adjective
Examples from the Corpus
southeastwards• The effects of the inversion decreases southeastwards and can not be seen at all in the south of Quadrant 53. 