A river system refers to a network of interconnected rivers and streams that drain an area of land. It includes the main river, tributaries, and other water bodies associated with them.
Related terms
Watershed: The land area that drains into a particular river or river system.
Tributary: A smaller stream or river that flows into a larger main river.
Estuary: The area where a river meets the ocean, resulting in brackish water (a mix of fresh and saltwater).