Using "River System" in a Sentence: Amazon Example

Example sentence:

"The Amazon river system is the largest river system in the world, spanning 6,400 km and draining an area of over 7 million km²."

Grammar Notes

• "River system" = common noun phrase (not capitalized unless part of proper name: "Amazon River system")
• Can be subject, object, or complement
• Often modified by proper name: "the Mississippi river system," "the Murray-Darling river system"

Alternative Constructions

• As subject: "A river system integrates tributaries, main stem, floodplains, and estuary into a functional hydrologic unit."
• As object: "Engineers modeled the Colorado river system to optimize reservoir operations."
• With preposition: "Sediment transport within the Mekong river system supports delta agriculture."
• Plural: "Comparing river systems reveals how tectonics shapes drainage patterns."

Definition for Clarity

A **river system** (or drainage basin/watershed) comprises a main river and all its tributaries, along with the land area drained—functionally connected by gravity-driven flow toward a common outlet.