subterranean river

river that runs wholly or partly beneath the ground surface

en-GB/ˌsʌbtɪˈɹeɪnɪən ˈɹɪvə/
en-US/səbtɚˈeɪniən ˈɹɪvɚ/

دسته بندی ها:

type of watercourseriversubterranea