5.Yemen

Yemen, officially known as the Republic of Yemen, is an Arab country in Southwest Asia, occupying the southwestern to southern end of the Arabian Peninsula. Yemen is the second largest country in the peninsula, occupying 527,970 km². The coastline stretches for about 2,000 km. It is bordered by Saudi Arabia to the north, the Red Sea to the west, the Gulf of Aden and Arabian Sea to the south, and Oman to the east. Although Yemen's constitutionally stated capital is the city of Sana'a, the city has been under rebel control since February 2015. Because of this, Yemen's capital has been temporarily relocated to the port city of Aden, on the southern coast.