I'm starting a campaign soon, and want to limit the mapmaking I have to do. The problem is, Google Maps doesn't seem to have a strong indexing system to allow for filtered searches.

Can anybody advise me on finding maps of things like "a small settlement in the desert" or "a small lake in the mountains"? Note that these aren't my actual search terms (I know who's likely to read this!), so methodology is useful but links to such maps are not.