What is another word for subterranean river?
Pronunciation: [sˌʌbtɪɹˈe͡ɪni͡ən ɹˈɪvə] (IPA) 
Subterranean river refers to an underground river flowing through a cave or beneath the Earth's surface into the sea. Other synonyms for subterranean river include underground stream, hidden river, subterranean course, subterranean water channel, and cave river. The water in these rivers is usually crystal clear and cold. These rivers provide shelter for a diverse range of animal species and unique geological formations such as stalactites and stalagmites that have formed over thousands of years. Subterranean rivers also provide an opportunity for exploration and adventure for those who are brave enough to explore the dark, mysterious underground world.
