2026 River Cup
Welcome to the 2026 River Cup! Vote for your favorites here to help us determine Earth's most remarkable river system!
Round 1: Vanishing Water Towers
Matchup 5: Semliki vs Indus
Semliki River
The Semliki River connects Lake Edward in the Democratic Republic of the Congo and Lake Albert, running through the Western Rift Valley and fed by runoff from the Rwezori Mountains.
Indus River
The Indus River is Asia's longest river, at nearly 2000 miles long (roughly 3190 km). It originates in the Tibetan Himalayas and flows through India and Pakistan before discharging into the Arabian Sea.
Cast your vote!
Matchup 6: Rhône vs East River
Rhône River
The Rhône is 505 miles long, starting at the Rhône Glacier in the Swiss Alps and discharging into the Mediterranean Sea
East River
Located in the Upper Colorado River Basin the East River Watershed spans 300 square kilometers and has a 1.4 km drop in elevation across the watershed.
Cast your vote!
Matchup 7: Niwot Ridge vs Upper Penticton
Niwot Ridge LTER
Niwot Ridge is an alpine/subalpine mountain range in the Rocky Mountains. It hosts a Long-Term Ecological Research (LTER) center at approximately 9,500 feet of elevation.
Upper Penticton Creek
The Upper Penticton Creek watershed is located in the forested Okanagan Highlands of British Columbia, Canada at an elevation of 1,600-2,100 meters.
Cast your vote!
Matchup 8: Cluthu/Mata Au vs Cayambe
Cluthu/Mata Au
Flowing over 210 miles, the Cluthu/ Mata Au river is the second-longest river in New Zealand.
Cayambe River
Located on the slopes of the Cayambe Volcano in the Andes Mountains, this headwater river is fed by glacial melt from the Hermoso Glacier.
Cast your vote!
RIVER CUP 2026 CURRENT BRACKET
YOUR CATCHMENT CUP 2025 WINNER: ONCA CATCHMENT!
YOUR CATCHMENT CUP 2025 WINNER: ONCA CATCHMENT!
Congratulations to our 2024 Earth's Most Remarkable River:
the Gila!
Congratulations to our 2023 World's Most Remarkable River:
