Vital Area Regulations Article 2
The boundary of a vital area is defined by outlining the outermost points of any military base or installation as a baseline perimeter, and includes any surrounding area bounded by a specified range of distances.
中文原文 要塞堡壘地帶法第2條
要塞堡壘地帶之幅員，以要塞、堡壘各據點為基點，或連結建築物各突出部之線為基線，自此基點或基線起，至其周圍外方所定距離之範圍內均屬之。