The phrase "northwestern portion" refers to the area or part of a place that is in the north and the west of a larger region, country, or state. Full definition
Most importantly, it is the location of the legendary Master Sword, which is held in a hidden northwestern portion of the woods filled with Animals. (zelda.gamepedia.com)
Except for those who live along the western and northwestern portions of the state. (fm.kuac.org)
These two holes, along with hole DK -10-03, are situated in the northwestern portion of Allana's claim block and were targeted to confirm historic drill results and test the extension of the Musley Deposit to the northeast. (geckoresearch.com)