How to get State/City name from longitude and latitude?

I am using Xamarin Forms. I can use the Xamarin Forms Labs' Geolocator (https://github.com/XLabs/Xamarin-Forms-Labs/wiki/Geolocator) to get the current longitude and latitude of the device.

My question is: What is the best way to get the State/City name of the current location?

Thank you!