How can I fix this distortion on this HDRi background? I'm trying to learn how to implement HDRi images into my background to improve render quality, and such. Here is the issue I'm having.



I was wondering if anyone knew whether the black hole in the image was the result of poor image quality or if I am doing something wrong in the settings. Here's how I have it set right now. Am I doing it right? 



Obviously I could just change the camera angle and hide that ugly thing, but if it's something I can fix, I'd like to learn how. Thanks in advance for any help you provide!

P.S. is there a way to get nice shadows with HDRi images, or do I have to set up lights to do something like that?

Edit: 
Changing the Mode from Mirror Ball to Equirectangular gives me this:
HDRi's should just be plug and play, and your image seems to contain the very same spot on itself. Your settings also seem just fine, thus, it appears your image is not good.

To fix your problem, try using a true HDRi from a sight like https://hdrihaven.com/hdris/, and all should be dandy.