noun
administrative district; administrative division
Refers to a geographic area defined for governmental or administrative purposes, such as a ward, county, or prefecture.
この地域は新しい行政区画に再編された。
This area was reorganized into a new administrative district.
行政区 is a more general term for an administrative ward or district, while 行政区画 emphasizes the division or demarcation itself.
Compound of 行政 (administration) and 区画 (division, section).