Wikipedia
Thinis or This ( Egyptian: Tjenu) was the capital city of the first dynasties of ancient Egypt. Thinis is, as yet, undiscovered but well attested to by ancient writers, including the classical historian Manetho, who cites it as the centre of the Thinite Confederacy, a tribal confederation whose leader, Menes (or Narmer), united Egypt and was its first pharaoh. Thinis began a steep decline in importance from Dynasty III, when the capital was relocated to Memphis. Its location on the border of the competing Heracleopolitan and Theban dynasties of the First Intermediate Period, and its proximity to certain oases of possible military importance, ensured Thinis some continued significance in the Old and New Kingdoms. This was a brief respite and Thinis eventually lost its position as a regional administrative centre by the Roman period.
Due to its ancient heritage, Thinis remained a significant religious centre, housing the tomb and mummy of the regional deity. In ancient Egyptian religious cosmology, as seen (for example) in the Book of the Dead, Thinis played a role as a mythical place in heaven.
Although the precise location of Thinis is unknown, mainstream Egyptological consensus places it in the vicinity of ancient Abydos and modern Girga.