How many ancient civilizations are there in the world? Which continent are they located in?

The four ancient civilizations are: ancient Babylon, ancient Egypt, ancient India and China.

China: The ancient Chinese nation established a slave country as early as 2 1 century BC in Xia Dynasty, and it has a written history since Oracle Bone Inscriptions in Shang Dynasty. The Simuwu Dafang Ding, which was cast in Shang Dynasty, weighs 875 kilograms and is the largest bronze ware found in the world at present. The world-famous Great Wall of Wan Li built by working people in ancient China has become a symbol of the long history of the Chinese nation.

Ancient India: Slavery appeared in ancient India in the South Asian subcontinent around 3000 BC. The ancient Indians invented the universal counting method and created the 10 counting symbol including "zero", which made the decimal system of 10 complete. Later, Arabs adopted it and introduced it into Europe, which was called "Arabic numerals".

Ancient Egypt: Ancient Egypt is located in the lower reaches of the Nile River in northeast Africa. In 3000 BC, the first unified slavery country in the world was established. The ancient Egyptians created hieroglyphics, formulated the world's earliest "solar calendar", calculated various areas with geometry, and built world-famous pyramids.

Babylon: Babylon is located in the Euphrates River and Tigris River basins in West Asia (that is, the two river basins, now in Iraq), and a unified centralized slave country was established in the18th century BC. King Hammurabi? -BC 1750) presided over the formulation of code of hammurabi, the earliest written code in history. Babylonians built hanging gardens. They take seven days as a week, which is the origin of the seven-day work system now. They also made outstanding contributions in astronomy, calendar and mathematics.