Sahara Desert Dasht-e Kavir Arabian Desert Gobi Desert
Ibb Aden Al-Hudaydah Sanaa
Qatar Somalia Saudi Arabia Oman
Horn of Africa Cap-Vert Sinai Peninsula Cape Peninsula
$9 000 $29 000 $900 $19 000
Persian Gulf Arabian Sea Persian Gulf Red Sea
Ibb Sanaa Al-Hudaydah Aden
21 million 210 000 210 million 2.1 million