also: ちない
noun
grounds; premises; land within boundaries
Refers to the area inside the boundaries of a specific piece of land, such as a school, temple, or private property. Often used in formal or legal contexts.
学校の地内では喫煙が禁止されています。
Smoking is prohibited on the school grounds.
この地内に無断で立ち入らないでください。
Please do not enter these premises without permission.
Compound of 地 (land, ground) and 内 (inside, within). The reading じない uses the go-on reading of 地, while ちない uses the kan-on reading; じない is more common in modern Japanese.