Columbia subject headings:
Egypt--Boundaries--Sudan.
Sudan--Boundaries--Egypt.
Ḥalāʼib Region (Sudan)--History.
Ḥalāʼib Region (Sudan)--International status.
Harvard subject headings:
Princeton subject headings:
Egypt--Boundaries--Sudan.
Ḥalfāʼ al-Jadīdah (Sudan)--History.
Sudan--Boundaries--Egypt.