The world's largest waterfalls ranked by average annual flow rate, measured in cubic metres per second — from the thundering Niagara to the vast cascades of the Congo River.
Quick answer: 1. Inga Falls, Democratic Republic of the Congo, 2. Boyoma Falls (Stanley Falls), Democratic Republic of the Congo, 3. Khone Falls, Laos, 4. Niagara Falls (Horseshoe Falls), Canada / USA, 5. Paulo Afonso Falls, Brazil, 6. Iguazu Falls, Argentina / Brazil, 7. Victoria Falls, Zambia / Zimbabwe, 8. Vermilion Falls, Canada, 9. Virginia Falls, Canada, 10. Kongou Falls, Gabon.
When people think of the world's largest waterfalls, height usually comes to mind first. But some of the most powerful waterfalls on Earth are not the tallest — they are the ones that move the most water. Flow rate, measured in cubic metres per second (m³/s), reveals a very different ranking: huge rivers cascading over escarpments and rapids. This list ranks waterfalls by average annual flow rate. Some entries on the list are cataracts or rapids rather than single-drop waterfalls — these are included because they function as waterfalls in terms of their hydraulic power and are classified as such by the World Waterfall Database.
Inga Falls is a massive cataract on the Congo River, often described as the largest waterfall by volume. With an average flow of 42,476 m³/s, it dwarfs every other waterfall on Earth. It is not a single vertical drop but a series of rapids and cascades over a 96 km stretch of river.
Boyoma Falls, historically called Stanley Falls, is a series of seven cataracts on the Congo River near Kisangani. Its average flow of 16,988 m³/s makes it the second-largest waterfall by volume, though it is a cascade of rapids rather than a sheer drop.
Khone Falls is the largest waterfall in Southeast Asia by volume, located on the Mekong River near the border with Cambodia. It is a wide, multi-tiered cataract with an average flow of ~11,600 m³/s, making it the widest waterfall in the world.
Niagara Falls is the most famous waterfall in North America and the largest by volume on the continent. The Horseshoe Falls alone carry an average of 2,832 m³/s over the brink. About 90% of the water flows over the Canadian Horseshoe Falls.
Paulo Afonso Falls is a series of cascades on the São Francisco River in northeastern Brazil. Its average flow of ~2,800 m³/s makes it one of the most powerful waterfalls in South America, though its flow has been partially regulated by hydroelectric dams.
Iguazu Falls is a spectacular system of 275 individual waterfalls spread over 2.7 km of the Iguazu River. Its average flow of 1,746 m³/s makes it the largest waterfall system in South America by volume, though it is best known for the U-shaped Garganta do Diabo (Devil's Throat).
Victoria Falls is one of the world's most famous waterfalls and the largest single sheet of falling water on Earth. Its average flow of 1,088 m³/s spans a width of 1,708 m, and its plume of spray can be seen from 50 km away.
Vermilion Falls is a large waterfall on the Peace River in Alberta, Canada. Its average flow of ~1,000 m³/s makes it one of the most powerful waterfalls in Canada, though it is less well-known than Niagara.
Virginia Falls is a massive waterfall on the South Nahanni River in the Northwest Territories of Canada. With an average flow of ~1,000 m³/s and a height of 96 m, it is both one of the most voluminous and tallest waterfalls in Canada. It is located in Nahanni National Park, a UNESCO World Heritage Site.
Kongou Falls is a large waterfall on the Ivindo River in Gabon, located in Ivindo National Park. Its average flow of ~900 m³/s makes it one of Africa's most powerful waterfalls, set in a pristine rainforest environment.
| # | Name | River | Location | Average flow | Height |
|---|---|---|---|---|---|
| 1 | Inga Falls, Democratic Republic of the Congo | Congo | DRC | 42,476 m³/s | Rapids (96 km stretch) |
| 2 | Boyoma Falls (Stanley Falls), Democratic Republic of the Congo | Congo (Lualaba) | DRC | 16,988 m³/s | Cataract (7 falls) |
| 3 | Khone Falls, Laos | Mekong | Laos | ~11,600 m³/s | Cataract (widest waterfall) |
| 4 | Niagara Falls (Horseshoe Falls), Canada / USA | Niagara | Canada / USA | 2,832 m³/s | 51 m |
| 5 | Paulo Afonso Falls, Brazil | São Francisco | Brazil | ~2,800 m³/s | 84 m |
| 6 | Iguazu Falls, Argentina / Brazil | Iguazu | Argentina / Brazil | 1,746 m³/s | 64–82 m |
| 7 | Victoria Falls, Zambia / Zimbabwe | Zambezi | Zambia / Zimbabwe | 1,088 m³/s | 108 m |
| 8 | Vermilion Falls, Canada | Peace | Canada | ~1,000 m³/s | ~10 m |
| 9 | Virginia Falls, Canada | South Nahanni | Canada | ~1,000 m³/s | 96 m |
| 10 | Kongou Falls, Gabon | Ivindo | Gabon | ~900 m³/s | 56 m |
Waterfalls are ranked by average annual flow rate (discharge) in cubic metres per second. Data is sourced from the World Waterfall Database, the US Geological Survey, and national hydrological monitoring agencies. Where multiple flow measurements exist, the average annual flow is used. 'Cataract' formations (rapids on the Congo and Mekong) are included per the World Waterfall Database classification. Niagara Falls flow reflects the combined Horseshoe and American Falls.
Inga Falls on the Congo River in the Democratic Republic of the Congo has the highest average flow rate at 42,476 m³/s, though it is a cataract rather than a vertical drop waterfall.
Niagara Falls (Horseshoe Falls) is the largest waterfall by volume with a classic vertical drop, at 2,832 m³/s average flow.
No. Flow rate measures the volume of water passing per second, while height measures the vertical drop. Many of the most voluminous waterfalls are relatively low in height but carry massive river flows.