Short answers, pulled from the story.
Upper Egypt is the southern portion of Egypt, stretching from Beni Suef down to Lake Nasser near the Aswan High Dam. In ancient Egyptian the region was called tꜣ šmꜣw, meaning the Land of Reeds or Sedgeland, named for the sedge plants growing there. In Arabic it is known as the Sa'id, from a root meaning to ascend or rise, reflecting its position as the upstream, elevated portion of the Nile Valley.
King Narmer, whose reign is dated to around 3150 BC, defeated his enemies in the Nile Delta and became the first sole ruler of both Upper and Lower Egypt. Before Narmer, the rulers of the Thinite Confederacy had been consolidating control over Upper Egypt during the Naqada III period, roughly 3200 to 3000 BC.
Upper Egypt was represented by the tall White Crown called Hedjet, the flowering lotus, and the sedge plant. Its patron deity was the vulture goddess Nekhbet. After unification with Lower Egypt, Nekhbet and her northern counterpart were jointly venerated as the Two Ladies, and the two crowns were combined into the Pschent double crown worn by pharaohs.
Bioarchaeologist Nancy Lovell concluded that ancient Upper Egyptians and Nubians had the greatest biological affinity to people of the Sahara and more southerly areas of Africa. S. O. Y. Keita characterized the skeletal morphologies of predynastic southern Egyptians as a Saharo-tropical African variant. A 1996 study by Lovell and Prowse found that elite individuals buried at Naqada were more closely related morphologically to populations in Northern Nubia than to those in Southern Egypt.
Genetic analysis of the 18th dynasty Amarna royal mummies, including Tutankhamun, Amenhotep III, and Akhenaten, identified haplogroup R1b and mtDNA K markers. Modern genetic analysis of the Upper Egyptian population at Adaima found 71% of cases carrying the E1b1 haplogroup and 3% carrying the L0f mitochondrial haplogroup. A 2004 mtDNA study clustered samples from Gurna, Upper Egypt, with Ethiopian and Yemeni groups.
Upper Egypt is considered to have formed the predominant basis for pharaonic cultural development, with the Proto-dynastic kings emerging from the Naqada region. Egyptologist Frank Yurco noted that Egyptian writing arose in Naqadan Upper Egypt and A-Group Lower Nubia, not in the Delta where direct western Asian contact occurred. Several dynasties of Upper Egyptian origin, including the 11th, 12th, 17th, 18th, and 25th, reunified pharaonic Egypt after periods of fragmentation.