WHAT IS CENTRAL ASIA? ■ 7
feet (12 m) above its current levels; in the 1840s it was several feet lower.
The level of the sea fell by eight feet (2.5 m) between 1929 and 1961 but
began rising again after 1978, climbing about eight feet by the end of the
mid-1990s before it stabilized. Higher rainfall levels might account for the
sea’s recent rise, but still scientists cannot fully explain it. About 70 per-
cent of the Caspian’s water comes from Europe’s longest river, the Volga,
whose southern-most section lies just beyond Central Asia’s western bor-
der. The Caspian Sea, whose waters cover enormous oil and natural gas
deposits, also is unbalanced. It reaches a depth of about 3,200 feet (975 m)
in the south, but its northern section on average is only 17 feet (5 m)
deep. As recently as 10,000 to 8,000 years ago, the northern section of the
sea dried up, leaving the Caspian one-third smaller than it is today.
North of the Caspian Sea, an arbitrary line divides Kazakhstan from
Russia and marks the rest of Central Asia’s western border. The line
extends northward just east and parallel to the Volga River for about 250
miles (400 km) before veering sharply to the east and, at the Ural River,
crossing from Europe into Asia.
In the south, due eastward from the Caspian Sea, a lowland about 150
miles (240 km) wide rises into a hilly region called the Köpetdag Moun-
tains. These low mountains separate Turkmenistan from northern Iran.
Further east are lower-lying deserts where Turkmenistan and Uzbekistan
meet Afghanistan. Central Asia’s southern tier then climbs steeply until,
in Tajikistan and Kyrgyzstan, it reaches the snow-capped Pamirs and the
Tien Shan range. Some peaks in these towering mountains rise above
24,000 feet (7,315 m). When the 13th-century Italian traveler Marco
Polo crossed these mountains, he called them the Roof of the World.
Central Asia’s eastern frontier, from south to north, traverses the Tien
Shan range in Kyrgyzstan and then, in Kazakhstan, descends to a track-
less plain that stretches beyond the horizon in every direction. The
region’s northern limit is the Kazakhstan-Russian border. On a map, this
border makes a wavy, undulating line more than 4,200 miles (6,800 km)
long through the emptiness of the Eurasian steppe.
Central Asia is a dry land. Its location near the heart of Eurasia means
it does not benefit from the sea breezes that bring the rain and moderate
the climates of regions nearer the coast. The Atlantic Ocean to the west
and the Pacific Ocean to the east are much too far away to supply moist
winds. To the south, the Indian Ocean and its coastal seas—the Arabian
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