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Zorluk: OrtaRelief, Physical Regions, and Drainage Systems of Nigeria

The Western Uplands (Yoruba Hills) form a major hydrological divide in southwestern Nigeria. Which of the following best describes the principal direction of flow for rivers taking their source from this physical region?

  1. They flow northward to join the River Niger and southward directly into the Atlantic Ocean.Cevap
  2. B
    They flow eastward to empty into the Lake Chad inland drainage basin.
  3. C
    They flow entirely westward to drain into the Volta River system in West Africa.
  4. D
    They drain exclusively into the Benue River trough through a series of deep gorges.

Cevap

Rivers taking their source from the Western Uplands flow in two main directions: northward into the River Niger and southward into the Atlantic Ocean.
The Western Uplands (Yoruba Hills) form a major east-west trending watershed in southwestern Nigeria. Rivers originating on the northern slope of this upland (e.g., Asa and Awun) flow northwards to join the River Niger, while rivers originating on the southern slope (e.g., Ogun, Osun, and Ona) flow southwards into the Atlantic Ocean (via the Bight of Benin).

Adım Adım Çözüm

1
Identify the physical region and its structural role.
The Western Uplands (Yoruba Hills) act as an elevated ridge separating two distinct slope directions in southwestern Nigeria.
Topography determines the direction of surface runoff and stream network orientation.
2
Trace the drainage slope north and south of the divide.
Streams on the northern slopes (such as the Asa, Awun, and Musa rivers) flow down toward the Niger valley, while streams on the southern slopes (such as the Ogun, Ona, Osun, and Yewa rivers) flow directly down toward the coastal lagoons and Atlantic Ocean.
Water naturally flows along the topographic gradient away from the central crest of the highland.

Anahtar Kavram

Hydrological divides and river drainage systems of Nigerian physical regions
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Konular

Relief, Physical Regions, and Drainage Systems of Nigeria

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