The mountain ranges of Europe and Asia
To the south and east of the mountain range are various fertile regions, watered by great rivers flowing from the mountains. By contrast, north of the mountain range is a continuous strip of less fertile grasslands - the steppes, on which a horseman can ride almost without interruption from Mongolia to Moscow.
This unbroken stretch of land north of the mountains, reaching from the Pacific in the east to the Atlantic in the west, means that the boundary between Asia and Europe is a somewhat vague concept. Indeed Europe is really the western peninsula of the much larger mass of Asia.
In the south there is a natural barrier, long accepted as a dividing line - formed by the waters of the Dardanelles, the Sea of Marmara, the Bosphorus and the Black Sea. North from here the boundary is notional. In recent times it has been accepted as passing east from the Black Sea to the Caspian and then stretching north from the Caspian along the eastern slopes of the Ural mountains.
The dates are still uncertain and much disputed. But at some time after 60,000 years ago people cross from southeast Asia to Borneo, the Philippines, New Guinea and Australia. And at some time after 30,000 years ago humans make the short but difficult leap from northeast Asia to northwest America.
The unsettling and the settled: from 8000 BC
For the emergence of a more developed society, justifying the name of civilization, history suggests that there is one incomparable advantage, indeed almost a necessity - the proximity of a large river, flowing through an open plain. In several places Asia provides this.
Indo-Europeans: from 2000 BC
Over the coming centuries they steadily infiltrate the more appealing regions to the south and west - occasionally in something akin to open warfare, and invariably no doubt with violence. But the process is much more gradual than our modern notions of an invading force.
India-Europeans in Asia: from 1800 BC
In doing so, they isolate themselves from the Indo-Europeans of north India, for they move to the south of a different linguistic group - the Dravidians, whose origin is unknown but whose language has no links with Indo-European. After another lengthy gap, in about the 11th century AD, members of the largest Dravidian community, the Tamils, move into Sri Lanka from southern India and settle in the north of the island.
Western Asia: from 1000 BC
The great civlizations of south and east Asia - India and China - are relatively isolated by the accidents of geography. But western Asia, and in particular the Mediterranean coast, is vulnerable to invaders from all sides.
Between India and China: 1st c. BC - 8th c. AD
With these exceptions, the region is still occupied at this time by neolithic communities.
East Asia: 1st millennium AD
North of the mountain ranges the nomads exert pressure southwards from time to time. For the most part they are easily contained. Early in the next millennium their turn will come, first with minor groups gaining territory in northern China and then with the violent eruption of the Mongols.
Turks and Mongols: 1000-1517
The first two decades of the 16th century bring renewed upheaval in two areas. A native ruler, the first of the Safavids, wins power in Persia. And in 1517 the Ottoman Turks extend their rule round the eastern Mediterranean and down into Egypt and Arabia.
The involvement of Europeans: 16th - 19th century
China retains a dignified isolation until brutally subdued by Britain in the two Opium Wars of the 19th century. Meanwhile China is acquiring a European neighbour to the north, with the expansion of the Russian empire to the Pacific. And the French win control of the part of southeast Asia which becomes known as Indo-China.
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