A homeschooling mom created a geography curriculum, Around the World in 28 Weeks, for her small co-op of 4-6 year-old students. The lessons are especially focused on geography, culture, art and literature, and are divided into 28 weeks: a different country or region for each week.
Each lesson includes a .pdf map, worksheets to print off, recipe or craft projects, and links to books and other resources.
Though every country cannot be represented in such a short curriculum, you could easily add other countries by using these lesson plans as an example from which to plan (I would add my favorite Pacific island, Papua New Guinea!).
To Get Started: Visit Cotton Ridge Homeschool, where you may view the Around the World in 28 Weeks free geography curriculum. You’ll be able to view the year’s schedule and see the supply list. Scroll lower, and you’ll see the lessons.