In this activity students find out number facts about other partners' countries (population, the longest river, the biggest city, the highest mountain, the number of national parks etc.)
Your students revise numbers, comparison of adjectives and make presentations about other countries. It's an effective way to learn by doing or finding out.
To make it a collaborative activity, your partners can give you the task with numbers and then you find out what these numbers stand for regarding their country.
Here is one of the presentations from "Count my country" activity: