The unique geographical disposition of South Africa had a large impact on the movements of Europeans that arrived at the southern tip of the African continent.
Since there were no roads or railroads, the explorers generally relied on waterways to navigate and penetrate deep into the interiors of continents. In South Africa this was impossible because of the intermittent nature of the rivers and great size and flow variation between the dry season and the wet season.
The outline is like the previous sketch of your writing, so it's necessary to have written a good outline in order to have clearly in mind which ideas are going to be included and how.
