Ancient Egyptian Civilization

Nile River: Longest river in the world, stretching over $4000\,\text{miles}$ ( $6436\,\text{km}$ ) and dividing into a delta before flowing into the Mediterranean Sea.
Regional Divisions:
- Lower Egypt: The Nile Delta region in the north, where major Egyptian cities developed.
- Upper Egypt: The land upstream to the south.
Fertility ("Black Land"): Annual autumn flooding deposited rich mud along the riverbanks, surrounded by outer desert regions ("Red Land").
Natural Barriers: Isolation and security were provided by deserts to the east and west, the Red Sea, northern Mediterranean Sea, and southern Nile cataracts (rapids).

Polytheistic System: Religion was deeply integrated into cosmic order, worshipping sun gods and river/land gods.
Sun Worship: The sun was worshipped as a primary source of life; rulers took the title "Son of Re" as earthly forms of the sun god.
Osiris and Isis Myth: Osiris served as a symbol of resurrection after Isis restored his body following his death by Seth.
Afterlife Beliefs: Preserving physical bodies allowed the spiritual self (ka) to return to tomb comfortable surroundings in the afterlife.

Unification: Around $3100\,\text{b.c.}$ , King Menes united Upper and Lower Egypt into one kingdom, starting the first royal dynasty.
Historical Periods: History is categorized into three major stable eras—Old Kingdom, Middle Kingdom, and New Kingdom—separated by political disorder during Intermediate periods.

Timeline of Egyptian Kingdoms

Era: Spanned from c. $2700\,\text{b.c.}$ to $2200\,\text{b.c.}$ under divine monarch pharaohs.
Government Organization: A bureaucracy managed by a vizier oversaw $42$ provinces led by appointed governors.
Mummification: A $70\,\text{days}$ process involving organ extraction into four specialized jars, brain removal through the nose, salt-drying, and resin-linen wrapping.
Giza Pyramid Complex:
- Great Pyramid of King Khufu (c. $2540\,\text{b.c.}$ , reported by Herodotus as taking $100000\,\text{Egyptians}$ over $20\,\text{years}$ to build): Measures $756\,\text{feet}$ ( $230\,\text{m}$ ) at each base side, stands $481\,\text{feet}$ ( $147\,\text{m}$ ) high, and spans $13\,\text{acres}$ ( $5.3\,\text{ha}$ ).
- Great Sphinx: A statue $240\,\text{feet}$ ( $73\,\text{m}$ ) long and $66\,\text{feet}$ ( $20\,\text{m}$ ) high featuring a lion body and human head, believed to depict Khafre.

Era: Lasted from c. $2055\,\text{b.c.}$ to $1650\,\text{b.c.}$ following a $150\,\text{years}$ period of disorder.
Golden Age: Characterized by stability and territorial expansion, including conquering Nubia to the south and leading military expeditions into Palestine and Syria.