In the given contour plot, different relief features are represented by contour lines. The contour lines represent areas of equal elevation. A steep slope is depicted by closely spaced contour lines, indicating a rapid change in elevation over a short distance. A river valley is shown by V-shaped contour lines, indicating where the river flows and the surrounding land is lower in elevation. A gentle slope is represented by widely spaced contour lines, indicating a gradual change in elevation.

Option 1 (Steep slope) is depicted in the contour plot and can be identified by closely spaced contour lines. Option 2 (River valley) is also depicted, as indicated by the V-shaped contour lines. Option 4 (Gentle slope) is also shown, where the widely spaced contour lines suggest a gradual change in elevation.

Therefore, the relief feature that is not depicted in the given contour plot is option 3, Conical hill. A conical hill would be represented by concentric contour lines with a circular pattern, indicating a peak or high point surrounded by lower elevations. Since such a pattern is not visible in the contour plot, the relief feature of a conical hill is not present.

Alert - correct answer should be 4 (Gentle slope) instead of 3 (Con