also: ほりあと
noun
remains of a dugout; trench remains
Typically refers to the physical remnants of a military dugout, trench, or similar earthwork, often encountered in historical or archaeological contexts.
戦場跡には今も壕跡が残っている。
The remains of dugouts still remain at the former battlefield.
壕跡から当時の遺物が発見された。
Artifacts from that era were discovered in the trench remains.
Compound of 壕 (ごう, 'dugout, trench') and 跡 (あと, 'trace, remains'). The reading ほりあと uses the kun'yomi ほり for 壕, but ごうあと is more common.