The following areas are to be treated as included in the
Tropical Zone—
(a) The Suez Canal, the Red Sea and the Gulf of
Aden, from Port Said to the meridian of longitude 45°E.
(b) The Persian Gulf to the meridian of longitude
59°E.
(c) The area bounded by the parallel of latitude
22°S from the east coast of Australia to the Great Barrier Reef,
thence the Great Barrier Reef to latitude 11°S. The northern boundary
of the area is the southern boundary of the Tropical Zone.