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The length may depend on whether the center or the edge of the river is measured. It may not be clear how to measure the length through a lake or reservoir. Seasonal and annual changes may alter both rivers and lakes. Other factors that can change the length of a river include cycles of erosion and flooding, dams, levees, and channelization.
Biologist and author Ruth Patrick, describing a table of high-discharge U.S. rivers, wrote that data on discharge, drainage area, and length varied widely among authors whose works she consulted. "It seems," she said, "that the wisest course is to regard data tables such as the present one as showing the general ranks of rivers, and not to ...
List of drainage basins by area (including rivers, lakes, and endorheic basins); List of largest unfragmented rivers; List of longest undammed rivers; List of river name etymologies
This is a list of longest rivers in the United States by state. It includes rivers that pass through the state or compose a portion of the state's border, as well as rivers entirely contained within the state.
Pages in category "Lists of longest rivers" The following 11 pages are in this category, out of 11 total. ... List of rivers of New Zealand by length; R ...
River Length Drainage area Average discharge (m³/s) Mouth Notes Reference Rank Amazon River: 6,937 km (4,310 mi) 6,992 km (4,345 mi) 7,050,000 km 2 (2,720,000 sq mi) ...
Pages in category "Lists of rivers" The following 28 pages are in this category, out of 28 total. ... List of river systems by length; List of river name etymologies ...
The list is at the outset limited to those rivers that are at least 250 km long from the most distant source, have a drainage basin (catchment area, watershed) of at least 10,000 km 2 (3,900 sq mi), or have a mean discharge (volume, flow) of at least 150 m 3 /s (5,300 cu ft/s). Also included are a number of rivers (currently 47) that do not ...