Please note: check the copyright information on each website. Using
images without an artist's explicit permission is stealing! The
following have stock images you can use for reference or ideas, but
always get permission if you plan to use the image within your work,
and you plan to distribute or sell your work.
Although the copyright requirements differ from site to site, you need to abide by these rules: 1. Images on these sites are for personal creative use only. 2. Using these images for commercial means violates copyright. 3. If you plan to use an image for a commercial endeavor, you must contact the artist.
If you are looking for a specific type of photography you could use the Image search feature within a web search engine, or do a keyword search: photography Africa or photography aerial.