We study geography year round but just once a week. My kids first learn about the continents, oceans and where they are. Last yr, we did American history so my dd1 learnt about the 50 states and can roughly place over 35 states correctly. This year, my oldest two learnt about where some countries are- mostly the ones they are likely to hear about and where we have relatives around the world.
On Monday, I will be testing them by giving them a blank map of the world and see how well they can label it.