One thing I have really enjoyed sending to my sponsored and correspondence kids is a map of my country. And the kids love that I have done this. I especially like this printable one from Coloring Castle. They also have flags you could print out.
A couple years ago when we moved from Michigan to Oregon, I sent a map showing where we were moving from and to.
I also send this to new kids - and show them where we live and where our families live. I tell them that I was originally from IL and my family still lives there and that my husband grew up in NY and his family still lives there.
Usually I color in the states I am talking about so they can see what I am talking about.
I have even colored in all the states we have lived in over the past 16 years.
And there are lots of other ways you can use a map in your letter writing. Recently I sent Benson a map of Europe and colored in the country of France so he could see where his sponsor lives.
Have you sent maps to your kids?