noun
residential area; residential district; residential zone
A designated area primarily for housing, often used in urban planning contexts.
この住居地域には高い建物が少ない。
There are few tall buildings in this residential area.
住宅地 is a more common, everyday term for a residential area, while 住居地域 is more formal and often used in zoning or legal contexts.
Compound of 住居 (dwelling, residence) and 地域 (area, region).