line of contact; no man's land
Technical term used in military contexts for the front line where opposing forces meet, or in geometry for the line along which two surfaces touch. The 'no man's land' gloss refers to the contested area between fronts.
Sporadic gunfire continues along the line of contact between the two armies.
In geometry, find the line of contact between the two curved surfaces.
中間地帯 means 'buffer zone' or 'intermediate area', which is a broader region, whereas 接触線 refers to the exact line of contact.
Compound of 接触 (contact) and 線 (line). The term is a direct translation of the English 'line of contact' and is used in technical and military contexts.