I know that Japan has a decent amount of support for bitcoin throughout their country. The country has been known for their support of BTC even at its lows, but for converting to cash, I think the US takes the cake. As far as I know, the amount of bitcoin ATM's in the US are far beyond anything else.

According to this site, there are over 1,500 bitcoin ATMs currently in the United States:

https://coinatmradar.com/country/226/bitcoin-atm-united-states/