Have your friends a subway ride away, or
A taxi ride away, or a trot down the street, or
Work with a group of colleagues who at some point became your friends without you even realising it, or
Can pick up the phone and chat to friends in the same timezone, or
Can pick up the phone and whatsapp someone "casuarina prata tonight ok?", or
Bump into friends ever so often randomly on the streets of a little country, or
Have regular girls' night outs or weekend brunch buddies, or ...
Don't take all that for granted.