Commentary of the Book of Mormon, Reynolds & Sjodahl, 1:359
“The large inland sea created late each spring as the Nile overflows its banks and floods a large part of the valley, like a tongue sticking far inland. Isaiah 19:5-10 describes the destruction of the Nile River in greater detail. If the Nile River is the ‘tongue of the Egyptian Sea,’ then this prophecy might have been fulfilled since the building of the Aswan Dam and the destruction of the traditional way of life along the Nile.” (Victor Ludlow, Isaiah: Prophet, Seer, and Poet, p. 176)