noun which may take the genitive case particle 'no', noun
in the prefecture; prefectural
Used attributively (often with の) to mean 'within a prefecture' or 'prefectural'. Common in news reports and administrative language.
県下の小中学校で一斉に防災訓練が行われた。
Disaster drills were held simultaneously at elementary and junior high schools across the prefecture.
県下全域に大雨警報
A heavy rain warning was issued for the entire prefecture.