Free-flowing rivers are the freshwater equivalent of wilderness areas

Free-flowing rivers, defined as those largely unaffected by human-made changes to flow and connectivity, are critical for biodiversity, groundwater recharge, and human survival. Only one-third of the world's 246 longest rivers (those 1,000 km or longer) remain free-flowing, with most remaining in remote, less developed, or politically complex regions. Infrastructure, particularly dams, roads, and buildings, disrupts sediment transfer and animal migration, threatening deltas and fish stocks. WWF aims to protect these systems by opposing harmful dams, promoting protective laws, supporting sustainable energy alternatives to hydropower, and pursuing dam removal.

• Only one-third of the world's 246 longest rivers, defined as those 621 miles (1,000 km) or longer, are still free-flowing and unimpeded by barriers.
• Free-flowing rivers are essential for maintaining deltas against rising sea levels by facilitating the transfer of sediment downstream.
• Human infrastructure is the primary cause of river flow interference, with dams blocking animal migration for species such as salmon and river dolphins, and roads or buildings disconnecting rivers from natural aquifers.
• The remaining long, free-flowing rivers are typically located in areas that are economically difficult to exploit, less developed, or have political conditions that hinder hydropower construction.

APA

WWF International (n.d.). Free-flowing rivers are the freshwater equivalent of wilderness areas. https://www.worldwildlife.org/resources/explainers/free-flowing-rivers/

Chicago

WWF International. Free-flowing rivers are the freshwater equivalent of wilderness areas. n.d. https://www.worldwildlife.org/resources/explainers/free-flowing-rivers/.

Wikipedia

{{cite report |author=WWF International |title=Free-flowing rivers are the freshwater equivalent of wilderness areas |url=https://www.worldwildlife.org/resources/explainers/free-flowing-rivers/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{wwfinternationalndfreeflowing, author = {{WWF International}}, title = {{Free-flowing rivers are the freshwater equivalent of wilderness areas}}, institution = {WWF International}, url = {https://www.worldwildlife.org/resources/explainers/free-flowing-rivers/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }