Red River

WordReference Random House Unabridged Dictionary of American English © 2025

Red′ Riv′er, 

1. Place Names a river flowing E from NW Texas along the S boundary of Oklahoma into the Mississippi River in Louisiana. ab. 1300 mi. (2095 km) long.
2. Place Names Also called Red′ Riv′er of the North′. a river flowing N along the boundary between Minnesota and North Dakota to Lake Winnipeg in S Canada. 533 mi. (860 km) long.
3. Place Names Songka.

Collins Concise English Dictionary © HarperCollins Publishers::

Red River noun

1. Also called: Red River of the South a river in the S central US, flowing east from N Texas through Arkansas into the Mississippi in Louisiana. Length: 1639 km (1018 miles)
2. a river in the northern US, flowing north as the border between North Dakota and Minnesota and into Lake Winnipeg, Canada. Length: 515 km (320 miles)
3. a river in SE Asia, rising in SW China in Yunnan province and flowing southeast across N Vietnam to the Gulf of Tonkin: the chief river of N Vietnam, with an extensive delta. Length: 500 km (310 miles)
   Vietnamese name: Song Hong