the whole area; the entire region; all parts (of)
Refers to the entirety of a geographical area, building, or physical space. Often used in news reports and formal descriptions.
The typhoon's effects extended across the entire prefecture.
この建物の全域でWi-Fiが利用できます。
Wi-Fi is available throughout this building.
the whole field (of study); every field; the whole gamut
Used for academic disciplines, professional domains, or a comprehensive range of topics. Slightly more abstract than sense 1.
彼の研究は医学の全域にわたっている。
His research spans the entire field of medicine.
この百科事典は科学の全域をカバーしている。
This encyclopedia covers the whole gamut of science.
A heavy rain warning was issued for the entire Kanto region due to the typhoon.
A thick fog covered the entire city.
Earthquake damage was confirmed throughout the entire prefecture.
Power outages occurred throughout the entire Kansai region due to strong winds.
He has knowledge spanning the entire field of economics.