Solutions River rising in Venezuela, forming part of its border with Colombia, and flowing into Atlantic has 5 entries with similar clues

• 3-letter words
• bugtributary of the narew river forming part of poland's border with both belarus and ukraine
• redRiver, its source in the United States, flowing north to empty into Winnipeg
• 5-letter words
• rhineRiver rising in Switzerland and flowing into the North Sea
• congoCentral African river flowing through Zaire into the Atlantic
• 6-letter words
• merseyRiver rising in Derbyshire and flowing into the Irish sea