Lower Nubia is the northernmost part of Nubia, downstream on the Nile from Upper Nubia. Sometimes, it overlapped Upper Egypt stretching to the First and Second Cataracts (the region known to Greco-Roman geographers as Triakontaschoinos), so roughly until Aswan. A great deal of Upper Egypt and northern Lower Nubia were flooded with the construction of the Aswan High Dam and the creation of Lake Nasser. However the intensive archaeological work conducted prior to the flooding means that the history of the area is much better known than that of Upper Nubia. Its history is also known from its long relations with Egypt.