沙漠（粵拼：saa1 mok6），全名沙質荒漠（saa1 zat1 fong1 mok6），係地球乾燥氣候影響下所產生嘅地貌，大約佔地球陸地整體面積嘅21%。沙漠地區一年平均降雨量一般低過250毫米(mm)，被沙質土壤冚住，植被稀疏。因為地表徑流稀少，喺明顯嘅風力作用下擁有獨特嘅地勢。
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