Geography
The road descends from 84 feet (25.6 m) above sea level at the northern end, the highest point, to a lowest point of 65 feet (19.8 m), just south of the overpasses, after which the road rises and falls before reaching a high point of 78 feet (23.8 m) at the southern end. The average grade of ascent or descent between the northern end and the lowest point is about 1.77 percent.
Read more about this topic: Portobello Road
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