边界线

boundary line
有形的～线visible boundary line/无形的～线invisible boundary line/陆地～线boundary line on land
相关词汇
传统习惯线 traditional customary boundary line
实际控制线 line of actual control
起点 starting point;initial point
终点 terminal point;terminus
东端 eastern extremity
西端 western extremity
东段 eastern sector
西段 western sector
中段 middle sector