birding...

Yemen, officially the Republic of Yemen is an Arab country located on the Arabian Peninsula in Southwest Asia. Yemen has a population of more than 20 million people and is bordered by Saudi Arabia to the North, the Red Sea to the West, the Arabian Sea and Gulf of Aden to the South, and Oman to the east. Yemen's territory includes over 200 islands, the largest of which is Socotra, about 415 kilometres (259 miles) to the south of Yemen, off the coast of Somalia. Yemen is the only republic on the Arabian Peninsula.

At 527,970 km² (203,837 sq mi), Yemen is the world's 49th-largest country (after France). It is comparable in size to Thailand, and somewhat larger than the U.S. state of California. Yemen is situated at 15°N 48°E. A number of Red Sea islands, including the Hanish Islands, Kamaran and Perim, as well as Socotra in the Arabian Sea belong to Yemen. Many of the islands are volcanic; for example Jabal al-Tair had a volcanic eruption in 2007 and before that in 1883.

Until recently, Yemen's northern border was undefined because the Arabian Desert prevented any human habitation there. The country can be divided geographically into four main regions: the coastal plains in the west, the western highlands, the eastern highlands, and the Rub al Khali in the east.

The Tihamah ("hot lands") form a very arid and flat coastal plain. Despite the aridity, the presence of many lagoons makes this region very marshy and a suitable breeding ground for malarial mosquitoes. There are also extensive crescent-shaped sand dunes. The evaporation in the Tihama is so great that streams from the highlands never reach the sea, but they do contribute to extensive groundwater reserves. Today, these are heavily exploited for agricultural use. Near the village of Madar about 48km North of Sanaa dinosaur footprints have been found, indicating that the area was once a mud flat.

The Tihamah ends abruptly at the escarpment of the western highlands. This area, now heavily terraced to meet the demand for food, receives the highest rainfall in Arabia, rapidly increasing from 100 mm (4 inches) per year to about 760 mm (30 inches) in Ta'izz and over 1,000 mm (40 inches) in Ibb. Agriculture here is very diverse, with such crops as sorghum dominating. Cotton and many fruit trees are also grown, with mangoes being the most valuable. Temperatures are hot in the day but fall dramatically at night. There are perennial streams in the highlands but these never reach the sea because of high evaporation in the Tihama.

The central highlands are an extensive high plateau over 2,000 metres (6,560 feet) in elevation. This area is drier than the western highlands because of rain-shadow influences, but still receives sufficient rain in wet years for extensive cropping. Diurnal temperature ranges are among the highest in the world: ranges from 30 °C (86 °F) in the day to 0 °C (32 °F) at night are normal.[citation needed] Water storage allows for irrigation and the growing of wheat and barley. Sana'a is located in this region. The highest point in Yemen is Jabal an Nabi Shu'ayb, at 3,666 meters (12,028 ft).

The Rub al Khali in the east is much lower, generally below 1,000 metres, and receives almost no rain. It is populated only by Bedouin herders of camels.