LTE cells above the water

Hello!

A few weeks ago I download the CSV file from Hong Kong to do some university stuffs. You cannot imagine my surprise when I realised there were a lot of stations (GSM, UMTS and LTE) above the water. I’ve never been there so I don’t know if it’s real data or, maybe, it is a position issue. I’ve been looking for information on the Internet but I’m not able to find an answer. I hope someone could help me in this.

Thank you so much!