noun
base of operations; foothold
Refers to a secure location from which activities are conducted, often used for military, business, or organizational bases.
その会社は海外に新たな根拠地を設けた。
The company established a new base of operations overseas.
ゲリラ部隊は山奥に
The guerrilla unit built a base deep in the mountains.
本拠地 specifically means 'home base' or 'headquarters', implying the main or original base, whereas 根拠地 can refer to any operational base.
Compound of 根拠 (basis, grounds) and 地 (land, place). The exact historical derivation is uncertain, but the word has been used since the early 20th century to denote a secure operational base.