This is the 15164th most frequent German word.
südwestlichen
"Southwestern."
Here 'südwestlicher' modifies 'Richtung', depicting the direction of the wind.
Der Wind aus südwestlicher Richtung bringt warmes Wetter.
The wind from the south-western direction brings warm weather.
In this sentence, 'südwestlichen' describes the area of the forests, specifying their location relative to other regions.
Wir haben eine Wanderung durch die südwestlichen Wälder gemacht.
We went on a hike through the south-western forests.
'Südwestliche' in this context specifies the part of the country depicted, indicating its geographical orientation.