I didn't get there for all of the prep work, but I know they spent a lot of time looking at Google Maps, trying to generate questions to ask their partner school. You could tell the other school had done this before because they asked really pointed questions and knew how to respond loudly so that our whole class could hear them easily. We both figured out what state each other was in pretty quickly (they were in California) but the cities took a while longer. For me, it was neat to see the wheels turning in students' heads, using their maps and knowledge of landforms, etc. to hone in on their faraway neighbors.
The other school had two representatives that did all of the talking and the class behind them supported them and did research. They figured out we were from Wenatchee first and it took us awhile to find them in San Bernadino, but we got it eventually. Thanks to Mrs. Brown's students for a fun morning!