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...amples of topographic maps which you have been pointed to, however, I suspect that you want to know where you can obtain topographic data from rather than a canned example. There are quite a few intricacies to the process so I will go through them for you. (1) Topography files can be found in the geomapdata library. You will probably want to use the maps package too (if you want to display coastlines). If you are zoomed in on a certain area, you will probably want to use the hi res coastline data found in the mapdata package. In the following code, I have also used the mapproj library which provides t...