Frequently Asked Questions
The most-asked questions about rivers.
What is this encyclopedia?
It is a community-built, unofficial reference dedicated to the world's rivers. It brings together facts, history, ecology, and culture around flowing waterways for enthusiasts and curious newcomers alike.
What exactly counts as a "river" on this site?
The site covers natural, perennial or seasonal watercourses that flow from a source such as a spring, glacier, or lake toward a larger body of water like a sea or ocean. Man-made canals and irrigation ditches are generally excluded unless they carry a historically significant natural flow.
Which rivers are considered the "main characters" of the site?
The most heavily covered entries are the Amazon, Nile, Yangtze, Mississippi, and Ganges, given their length, cultural significance, and ecological impact. Regional favourites like the Danube, Mekong, and Congo also have detailed sub-pages.
Where should a first-time reader begin?
Start with the "Major River Systems" overview page, which maps the ten longest rivers and their drainage basins. From there, pick a region or a single river that interests you and follow the linked ecology, history, and culture sections.
How many rivers exist on Earth?
There is no single agreed-upon count because the threshold separating a river from a stream varies by definition. Most hydrological estimates place the number of named rivers above 25,000, while unnamed tributaries number in the millions.
What are some "notable moments" in river history?
Highlights include the 1936 Mississippi flood, the 1984 Ganges pollution crisis that spurred India's National River Conservation Plan, and the 1950s damming of the Columbia River that reshaped Pacific Northwest ecology. The site also tracks record-breaking ice-jams, first crossings, and major dam completions.
What key facts should every newcomer know?
Rivers drain roughly 75 % of the Earth's land surface and are the primary conduit connecting freshwater ecosystems to the oceans. They shape continents through erosion and deposition, support an estimated 40 % of all freshwater fish species, and have served as trade routes and cultural boundaries for millennia.
Is this site peer-reviewed or official?
No. It is written and maintained by volunteers and river enthusiasts, not by a government agency or academic body. Entries cite public-domain and open-access sources, but readers should treat the content as a guided starting point rather than a citable scientific reference.
How does the site handle the difference between a river and a stream?
A stream is typically a smaller, often shallower channel with a limited drainage area, while a river is a larger, usually deeper watercourse with a more substantial and sustained flow. The boundary is fluid; some entries note where a tributary effectively "graduates" into a river based on local hydrological conventions.
Can fans contribute or suggest new entries?
Yes. The project accepts community-submitted corrections, translation requests, and proposals for under-covered rivers through its open contribution channel. Submissions are reviewed by volunteer editors before publication to keep the encyclopedia accurate and well-sourced.