Modern name for a site in Nubia near the Second Cataract of the Nilewhere a fortress, temple, and settlement were erected during Dynasty 12 on the west bank, probably begun under Senusret I and completed under Senusret III, after who it was named SekhemKhakaure. Nearby was a second fort, now known as Semna South, ancient Egyptian DairSeti. Semna marked the limit of Egyptian control during the Middle Kingdom. The site was excavated by George Reisner from 1924–1928 and again during the 1960s. The area is now flooded by Lake Nasser, the lake formed by the Aswan High Dam, but part of the temple was removed to safety.
Historical Dictionary Of Ancient Egypt by Morris L. Bierbrier
Ancient Egypt. A Reference Guide. EdwART. 2011.