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During the third millennium B.C., diverse populations inhabited the vast areas stretching from the Mediterranean Sea to the Indus River and from Central Asia to the Gulf. Among the most intriguing of these peoples are those who dwelt in the cities and countryside of Sumer (southern Mesopotamia).
millennium, a period of 1,000 years. The Gregorian calendar, put forth in 1582 and subsequently adopted by most countries, did not include a year 0 in the transition from bc (years before Christ) to ad (those since his birth). Thus, the 1st millennium is defined as spanning years 1–1000 and the 2nd the years 1001–2000.
The 3rd millennium is the current millennium of the Gregorian calendar that began on January 1, 2001, and will end on December 31, 3000. It is distinct from the 2000s millennium, which began on January 1, 2000, and will end on December 31, 2999. Centuries. 21st century. 22nd century. 23rd century. 24th century. 25th century. 26th century.
