extensive

ɪkˈstɛnsɪv
ɛkˈstɛnsɪv

adjective

covering or affecting a large area.

an extensive garden

large,large-scale,sizeable,substantial,considerable,ample,great,huge,vast,immense,boundless,immeasurable,spacious,capacious,commodious,voluminous,roomy,broad,expansive,sweeping