Proper noun
Lower Nubia
The northern part of the ancient kingdom of Nubia, lying between the first and second cataracts of the Nile river and conquered by Ancient Egypt during both the Middle Kingdom and New Kingdom periods; roughly corresponds to the portion of Nubia to the north of the present-day border between Egypt and Sudan.
Lake Nasser's waters fill the area through Lower Nubia (Upper Egypt and northern Sudan) within the narrow canyon between the cliffs of sandstone and granite created by the flow of the river over many centuries. Source: Internet