地理界线是划分相邻地域单位的线或带，地理界线一般位于地理要素或地理综合特征变化梯度最大的带段。按属性可分为自然地理界线与社会经济地理界线。
必须指出，这种区域划分并无严格的地理界线。
It should be pointed out that these designations are not hard and fast geographical boundaries.
该带不仅是一个地理界线，而且是一个由基底断裂带控制的前第三系雁列褶皱带和第三系构造转换带。
It serves not only as a geographic boundary but also as pre-tertiary en-echelon drapes and a Cenozoic tectonic conversion zone controlled by the basement fault zone.
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