---
id:"kb-2026-00390"
title:"Sahara Desert"
schema_type:"TechArticle"
category:"geography"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"Sahara: A Natural History (de Villiers & Hirtle)"
    type:"book"
    year:2002
    url:"https://www.bloomsbury.com/us/sahara-9780802713568/"
    institution:"Walker Books"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
  - title: "RESTful Web APIs"
    authors: ["Richardson", "Amundsen"]
    type: "book"
    year: 2013
    url: "https://www.oreilly.com/library/view/restful-web-apis/9781449359713/"
    institution: "O'Reilly"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## TL;DR

The Sahara Desert (9.2 million km²) is the world's largest hot desert, spanning 11 North African countries. Contrary to perception, only ~25% is sand — most is rock/gravel plateaus (hamada). Once a green savannah (African Humid Period, 10,000-5,000 years ago) with lakes and wildlife.

## Core Explanation

Climate: extreme temperatures (day 50°C+, night near freezing). Rain: <25mm/year in driest areas. Dust: Sahara is Earth's largest dust source — fertilizes Amazon rainforest across Atlantic. Oases: underground water sources sustain life. Sahara expands/contracts with climate cycles (currently growing ~10% per century). Tuareg: nomadic 'Blue People' of the Sahara.

## Further Reading

- [Sahara: A Natural History (de Villiers & Hirtle)](https://www.bloomsbury.com/us/sahara-9780802713568/)