地区 is read as ちく (chiku) and means district.
ちく
chiku
ちほうく
prefectural constituency
ちくけいかく
district plan
どうわちく
assimilation district
がざちく
Gaza Strip
じんこうしゅうちゅうちく
densely inhabited district
どうぶつちりく
zoogeographical region
ちゅうしんぎょうむちく
central business district
こうぎょうちく
industrial zone
ぶんきょうちく
school zone
きょうさんちく
communist area
しょうぎょうちく
commercial district
じゅうたくちく
residential district