The Sahara Desert is located in the northern portion of Africa and covers over 3,500,000 square miles(9,000,000 sq km)or roughly 10%of the continent.It is bounded in the east by the Red Sea and it stretches west to the Atlantic Ocean.To the north,the Sahara Desert's northern boundary is the Mediterranean Sea,while in the south it ends at the Sahel,an area where the desert landscape transforms into a semi-arid tropical savanna.
撒哈拉沙漠位于非洲北部，面积超过350万平方英里(900万平方公里)，约占非洲大陆的10%。它东临红海，向西一直延伸到大西洋，它北靠地中海，往南至萨赫勒终结，在萨赫勒，沙漠景观逐渐转变为半干旱热带稀树草原景象。
Since the Sahara Desert makes up nearly 10%of the African continent,the Sahara is often cited as the world's largest desert.This is not entirely true,however,as it is only the world's largest hot desert.Based on the definition of a desert as an area receiving less than 10 inches(250 mm)of precipitation per year,the world's largest desert is actually the continent of Antarctica.
由于撒哈拉沙漠占据非洲大陆近10%的面积，它常常被称为世界上最大的沙漠。然而，这种说法并不准确，它只是世界上最大的热沙漠。根据沙漠的定义--区域年降水量不足10英寸(250mm)，南极洲大陆才是世界上最大的沙漠。
Geography of the Sahara Desert
撒哈拉沙漠的地理
The Sahara covers parts of several African nations including Algeria,Chad,Egypt,Libya,Mali,Mauritania,Morocco,Niger,Sudan,and Tunisia.Most of the Sahara Desert is undeveloped and features a varied topography.Most of its landscape has been shaped over time by wind and includes sand dunes,sand seas called ergs,barren stone plateaus,gravel plains,dry valleys,and salt flats.Around 25%of the desert is sand dunes,some of which reach over 500 ft(152 m)in height.
撒哈拉沙漠覆盖了几个非洲国家的部分地区，包括阿尔及利亚、乍得、埃及、利比亚、马里、毛里塔尼亚、摩洛哥、尼日尔、苏丹和突尼斯。撒哈拉沙漠大部分地区不发达，且具有地形多样化的特点。沙漠中大部分景观都是随着时间的推移由风塑造而成的，包括沙丘、称为ergs(沙漠中随风移动的大沙丘)的沙海、贫瘠的石质高原、砾石平原、干燥的山谷和盐滩。其中沙丘约占25%，某些沙丘的高度甚至超过500英尺(152米)。
There are also several mountain ranges within the Sahara and many are volcanic.The highest peak found in these mountains is Emi Koussi,a shield volcano that rises to 11,204 ft(3,415 m).It is a part of the Tibesti Range in northern Chad.The lowest point in the Sahara Desert is in Egypt's Qattara Depression at-436 ft(-133 m)below sea level.
在撒哈拉沙漠中也有一些山脉，其中大部分为火山山脉。这些山脉中最高的山峰名为埃米库西，是一座高达11204英尺(3415米)的盾形火山。它是乍得北部提贝斯蒂山脉的一部分。撒哈拉沙漠的最低点是埃及的盖塔拉洼地，海拔-436英尺(-133米)。
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