Meaning of かつどうはんい in Japanese

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Definition of かつどうはんい

かつどうはんい(katsudouhani) 【活動範囲】

(n) sphere of action; scope of activity; range of work
まず、私の活動範囲は、おもに養老川下流域です。
First off, my area of work is mainly in the lower reaches of the Yourou River.