Marginal Lands in Africa: Extent, Challenges & Potential

Marginal lands—areas with limited agricultural potential due to poor soils, erratic rainfall, extreme temperatures, or degradation—cover a vast portion of Africa.

Estimated Extent

• World Bank: ~30% of Africa's total land area.
• Other studies (FAO, UNCCD): Up to 40–45% when including degrading lands.
• Concentrated in: Sahel, Horn of Africa, Kalahari margins, East African Rift valleys, Southern African drylands.

Key Constraints

• Soil: Low organic matter, nutrient depletion, acidity/salinity, shallow depth.
• Water: Low/unpredictable rainfall (250–600 mm/yr), high evaporation, limited groundwater.
• Climate: High temperatures, frequent droughts, increasing variability.
• Degradation: Erosion, desertification, overgrazing, deforestation.

Livelihoods at Risk

Millions of pastoralists and smallholders depend on these lands. Low productivity → food insecurity, poverty, migration, conflict.

Innovation & Investment

• Drought-tolerant crops: Millet, sorghum, cowpea, improved maize.
• Soil/water conservation: Zai pits, half-moons, contour bunds, agroforestry (Faidherbia).
• Index-based livestock insurance (Kenya, Ethiopia).
• Restoration: Great Green Wall (Sahel), AFR100 (100M ha by 2030).

Need for Scale

Pilot successes exist. Massive, sustained investment—in research, extension, rural finance, land tenure security, and climate adaptation—is essential to unlock marginal lands' potential and secure livelihoods.