Northwest
noun, の adjective
This word is so simple. North + West = Northwest.
ほくせい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
北西に見える山が、ふじ山です。
The mountain you can see in the northwest is Mt. Fuji.
ポートランドの北西に、シーサイドという町があります。
There is a town called Seaside northwest of Portland.
北西の角にスーパーが一つあります。
There is a supermarket in the northwest corner.