Maps are a powerful tool for conveying information about an area. As such, they're excellent for teaching. Google has actually already created a few that are built in to the mobile app (though they're absent from the web My Maps application, it seems you can find some here). Educators can use the area drawing tools to create maps and embed charts that show data corresponding to a specific region.
You can add text, images, or even YouTube videos to the annotations that accompany drawn shapes. As a demonstration, in this sample, I can create a field surrounding my home state of Georgia. In the info box that's associated with that field, I can embed a YouTube video that I'm sick of hearing about my state.
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