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The Mountainous Region of Yemen were created due to the African split which was occurred by the drift apart and hence formed the Red Sea and the Gulf of Aden, it's heights is gradually rising from 1000 - 3600m as the heights acme of the mount of (Nabi Shuaib) reaches 3666m, which is the highest acme in the Arabian Peninsula and the Sham. 

The distribution line of water is in these mountains from where water runs easterly, westerly, northerly and southerly. And the main of these (Wadies) are : 

• The Wadies run water to the Red Sea are :- Wady Harad, Wady Mour, Wady Surdud, Wady Rama, Wady Siham, Wady Zabid, Wady Mawza and Wady Rasiyan. 
• The Wadies pouring in the Gulf of Aden and the Arabian Sea are :- Wady Tuban, Wady Bana, Wady Ahur and Wady Hadramaut. 
• The Wadies sloping to the east :- Wady Khabb, Wady Al-Jawf and Wady Adhana. 
• The Wadies sloping to the north and north east are :- Wady Harib, Wady Markha, Wady Jardan, Wady Aiot Al-Sayar, Wady Ramah and Wady Shuaith. 

The Plateau Region is situated in the east and north of the mountainous heights and parallel to it but it is expanded more towards Al-Ruba al-Khali, and gradually begins to descend. Its maximum height is 1000m. And it includes Sa'da region, Al-Jawf Province, Shabwa Province, Hadramaut Province and Al-Mahara Province. 

It is formed from hill rocks and water slopes to it from the mountainous areas, and its edges are interweaved to the Ruba al-Khali from the north side.
 

The Coastal Region includes the plain coasts of the Red Sea, the Gulf of Aden and the Arabian Sea. it is linked to each other forming a coastal strip and extends from the borders of Oman south west towards Bab al-Mandab and turn direction to the Saudi borders. Its length is nearly 2000 Km. The width of this area varies between 30 - 60 Km.
 

Al-Ruba Al-Khali Region is part of the desert regions of Yemen which permeated by some land plants specially in its edges intercepted with the plateau region through the seasonal wadies and sand roots. 

Names of the Ruba Al-Khali are numerous through the historical periods of yemen, thus we find it named :- The Quivering Sea, the Clear Sea, the Great Yemeni Desert and the Curvilinear Desert etc.. and whenever we go far in the Ruba Al-Khali the plant life and water become rare and the movable sand dunes increase, and which vanishes the features and traces.
 

The Yemen Isles Group are scattered in the sea zone of yemen in the Red Sea and in the Arabian Sea and has its own climate, weather and environment as it has its natural reliefs and formations, most of the Islands concentrate in the Red Sea distributed along the yemeni coast forming an archipelago. The main and large one is Kamaran which is inhabited with people and with some land rare animals. And to the north of it there is the Island of Baklan, Al-Tair and Al-Fashit, and to the south of Kamaran Hanesh Al-Kabeer and Hanesh Al-Saquir islands. The Island of Mayoon "Terim" divides the strait of Bab Al-Mandab into two parts. 

The Yemeni islands in the Arabian Sea are found near each other and the well known one is Sokatrah Island land of Andem and Dam Al-Akhwan tress which produces olibanum medicinals, incenses and dyes some of which are used for decoration also found in this island are some animals of African origin. 

Near Sokatrah island also there are a group of small isles the main of which is the island of Abdel Kuri, and islands of the two brothers (Samha & Darsa).