We haven't done this yet, so take it for what it's worth....but I am planning to a world geography overview with my dd nest year (2nd grade). The resources I am planning to use are:
For Physical Geography:
CM's Elementary Geography (free online)
Supplemented by Legends and Leagues (mentioned above by lgeurink) for map-reading skills
For Cultural Geography:
The Seven Sisters by Jane Andrews (from Yesterday's Classics)
several of the Twins books by Lucy Fitch Perkins (also Yesterday's Classics) - which ones will depend on interest and time
We will probably also spend a couple weeks on the Arctic/Antarctic just because this area of the world isn't covered in depth in the SCM modules which we plan to start the following year. We also have the books What the World Eats and Material World (recommended as resources on the SCM curriculum guide) so will reference the appropriate sections of these as we read about different areas of the world in the above.
For map drill, we will learn the continents and oceans. We already find different countries/states on the map as we read about things, and will continue to do that.
We will take a full year to do this, probably twice a week - one day for a reading/possible actvity on physical geography and another for a reading/activity on cultural geography.
HTH some. Like I said, I haven't actually done this yet, but it is a plan I am excited about for next year. HTH some.