Wahah

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Ein-Kelt, sebuah wahah di Gurun Judean, Israel

Dalam geografi, sebuah wahah adalah sebuah kawasan terpencil kehijauan di sebuah gurun, biasanya mengeliling sebuah mata air atau sumber air yang mirip. Wahah juga memberikan habitat untuk haiwan dan manusia jika kawasan itu cukup besar.

Lokasi wahah telah menjadi kepentingan kritikal untuk jalan perdagangan dan angkutan di kawasan-kawasan gurun. Kabilah-kabilah harus mengambara melalui wahah supaya bekalan air dan makanan dapat ditambah. Oleh itu, kawalan politik atau ketenteraan sebuah wahah telah dalam banyak perkara bermakna kawalan perdagangan pada jalan yang khusus. Contohnya, wahah Awjila, Ghadames dan Kufra, terletak di Libya hari ini, telah pada pelbagai kali menjadi penting pada perdagangan di Sahara Utara-Selatan dan Timur-Barat. Perkataan wahah dalam bahasa Melayu diinjam dari bahasa Arab واحةwaahah.

The Huacachina oasis in Ica, Peru

Wahah dibentuk dari sungai bawah tanah atau akuifer seperti sebuah artesian aquifer, di mana air dapat mencapai permukaan secara semlajadi oleh tekanan atau perigi-perigi dibina manusia. Occasional brief thunderstorms provide subterranean water to sustain natural oases, such as the Tuat. Substrata of impermeable rock and stone can trap water and retain it in pockets; or on long faulting subsurface ridges or volcanic dikes water can collect and percolate to the surface. Any incidence of water is then used by migrating birds who also pass seeds with their droppings which will grow at the water's edge forming an oasis.

Tumbuhan membesar[sunting | sunting sumber]

Oasis in the Libyan part of the Sahara

People who live in an oasis must manage land and water use carefully; fields must be irrigated to grow plants like dates, figs, olives, and apricots. The most important plant in an oasis is the date palm which forms the upper layer. These palm trees provide shade for smaller trees like peach trees, which form the middle layer. By growing plants in different layers, the farmers make best use of the soil and water. Many vegetables are also grown and some cereals, such as wheat, barley and millet are grown where there is more moisture. [1]

Wahah terkenal[sunting | sunting sumber]

Afrika[sunting | sunting sumber]

Benua Amerika[sunting | sunting sumber]

Asia[sunting | sunting sumber]

Australasia[sunting | sunting sumber]

Eropah[sunting | sunting sumber]

Lihat juga[sunting | sunting sumber]

Bibliografi[sunting | sunting sumber]

Rujukan[sunting | sunting sumber]

Pautan luar[sunting | sunting sumber]