Which of the following features is associated with the upper course of a river?

Step 1: Analyze the question The question asks which feature belongs to the upper course (also called the youthful stage) of a river.

Step 2: Key concept A river has three main courses:

• Upper course (youth): Near the source, usually in highlands. The land is steep, so the river flows fast and has strong vertical erosion (downcutting). Typical features: V-shaped valleys, interlocking spurs, rapids, waterfalls, gorges, and potholes.
• Middle course (maturity): The gradient is gentler. Lateral (sideways) erosion and transportation increase. Typical features: meanders, floodplains, and levees begin to appear.
• Lower course (old age): Very gentle gradient, and the river deposits a lot of material. Typical features: wide floodplains, levees, ox-bow lakes, braided channels, estuaries, and deltas.

Step 3: Check each option

• A. Levee: Formed by deposition during floods on the banks of the middle and lower course. ❌
• B. Meander: Winding bends formed by lateral erosion and deposition in the middle and lower course. ❌
• C. Delta: Formed by deposition where the river enters a sea or lake, which is the lower course. Think of the Niger Delta. ❌
• D. Waterfall: Forms when a river flows over a band of hard rock onto softer rock. The soft rock erodes faster, creating a drop. This happens in the steep upper course. Examples are Erin-Ijesha (Olumirin) Waterfall in Osun State and Farin Ruwa Waterfall in Nasarawa. ✅

Step 4: Answer The feature associated with the upper course is the waterfall, which is option D.

Exam tip: Remember "Upper = Up and Down." Upper-course features come from downward (vertical) erosion: V-valleys, waterfalls, rapids, gorges. Features with bends or spreading out, such as meanders, levees, ox-bow lakes, and deltas, belong to the middle and lower courses.