This article provides an organized list and brief descriptions of the principal rivers and seasonal watercourses in the Republic of Niger. For general context about rivers worldwide see rivers. For information about the country and its geography, see Niger.

Overview

Niger's hydrography is dominated by the Niger River, which arcs through the western part of the country and supplies year-round flow. Much of Niger lies in the Sahel and Sahara zones, so many other named channels are ephemeral — they flow only in the rainy season and are often called dallols or wadis. Several rivers cross or form borders with neighbouring states, so Niger's watercourses are important in regional hydrology.

Major perennial rivers

  • Niger River — The principal river in the country, providing year-round water for transportation, irrigation, fisheries and urban supplies.
  • Komadougou Yobe — A seasonal to intermittent river that forms part of the Nigeria–Niger border and drains toward the Lake Chad basin in wetter years.
  • Mékrou River — A transboundary tributary in the Niger–Benin–Burkina Faso area; important for local wetlands and cross-border conservation zones.

Seasonal rivers, dallols and wadis

Across southern and central Niger, many channels flow only during the rainy season. These are central to cropping, pastoral watering and groundwater recharge, but dry to dust in long dry seasons.

  • Goulbi de Maradi — A seasonal stream in south-central Niger and adjacent Nigeria that supports local farming during rains.
  • Dallol Bosso — A long, mostly dry valley running north–south that conducts floodwater and recharges local aquifers.
  • Dallol Maouri — Another seasonal valley used for grazing and short-term agriculture in the Dosso region.

Uses, importance and issues

Rivers and seasonal channels in Niger are vital for irrigation, livestock, small-scale fisheries and drinking water. They sustain important wetland habitats and are focal points for towns and markets. Pressures include variable rainfall, overuse of surface and groundwater, soil erosion and occasional upstream abstraction; several development projects have sought to improve storage and irrigation while balancing environmental needs.

Notes and further information

This list highlights prominent and representative watercourses rather than every named stream. Local maps and hydrological surveys provide fuller, place-specific names and seasonal behaviour. For regional overviews consult hydrology resources and country profiles linked above.