沟 (w)

(gōu) ditch; gutter; groove; gully; ravine; CL:道[dao4]

沟壑 (w)

(gōuhè) gorge; gulch; ravine; deep ditch

沟渠 (w)

(gōuqú) channel; moat; irrigation canal

沟涧 (w)

(gōujiàn) gully; ravine

沟谷 (w)

(gōugǔ) gully

沟通 (w)

(gōutōng) to join; to connect; to link up; to communicate

沟道 (w)

(gōudào) groove