I was recently working on a different project and thought it might be useful to know whether a given location (latitude and longitude) is either on land or in water. Finding out how to do this was a little bit tricky, so I thought I’d share how to do this in a blog post. What we’ll be building is a simple web app, which allows you to click on a map. When you do this, an info bubble will pop up to tell you whether you clicked on land or water! If you’re in water, the info bubble will also tell you what the name of the body of water is.