Nguồn (also Năm Nguyên) is a Vietic language spoken by the Nguồn people in the Trường Sơn mountains in Vietnam's North Central Coast region as well as in nearby regions of Laos.
Most Nguồn speakers in Vietnam live in the secluded Minh Hóa district of Quảng Bình Province, with others in the area around Đồng Lê, the seat of Tuyên Hoá District, approximately 50 km (31 mi) from the National Highway 1.
The Nguồn language has been variously described as a dialect of Vietnamese or as the southernmost dialect of Mường. Some researchers who consider it more closely related to Mường find that those who connect it more closely with Vietnamese are more influenced by ethnographic and/or political concerns than linguistic evidence. Chamberlain (2003) and Sidwell (2009) count it as a third Viet–Muong language.

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