der Südwest
southwest
The compass direction exactly between south and west.
Das Fenster meines Zimmers ist nach Südwest ausgerichtet.
The window of my room faces southwest.

southwest
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southwest
The compass direction exactly between south and west.
Das Fenster meines Zimmers ist nach Südwest ausgerichtet.
The window of my room faces southwest.

The word is simply made up of the compass directions 'Süd' (south) and 'West' (west). This pattern applies to all intercardinal directions, such as 'Nordost' (northeast) or 'Südost' (southeast).
Der Vogelzug folgt der Route von Nordost nach Südwest.
The bird migration follows the route from northeast to southwest.
All compass directions are masculine in German. Therefore it is always 'der Südwest' (the southwest), just like 'der Norden' (the north), 'der Osten' (the east), or 'der Südosten' (the southeast).
Der Kompass zeigt genau nach Norden.
The compass points exactly north.
To indicate a direction or orientation, 'Südwest' (southwest) is often used with the preposition 'nach' (to/toward). To describe a location, you can use 'in' or 'im' (in the).
Die Terrasse ist nach Südwest ausgerichtet.
The terrace faces southwest.
To distinguish the meanings: when 'Südwest' (southwest) is the subject with weather verbs such as 'wehen' (to blow) or 'bringen' (to bring), the wind is meant. When it is connected with a genitive or 'von' (of/from), a region is meant.
Der Südwest weht heute sehr stark.
The southwest wind is blowing very strongly today.
southwest
'der Südwesten' and 'der Südwest' can both mean the direction between south and west or a region in that direction. In many geographical sentences, they are very similar. In everyday language, 'der Südwesten' often sounds a little more complete and is very common when talking about parts of a country. 'der Südwest' is shorter and can also mean a region, but it sometimes sounds a bit more concise or technical, for example in weather reports or map references. They are easy to confuse because they look almost the same. The important point is: in the meaning of a direction or area, they usually mean the same thing; 'Südwest' can additionally refer to a wind, but that is not the shared usage here.

Auf der Karte ist der Südwest der Region grün markiert.
On the map, the southwest of the region is marked in green.
Viele Gäste kommen im Sommer in den Südwesten Deutschlands.
Many guests come to the southwest of Germany in summer.