National Geographic has an Expedition Game which is a series of learning games accessible to English Language Learners. You have to finish one mission in order to go to the next one.
You have to go through a number of fancy-looking “hoops” to start the first mission, and Beginning ELL’s might need some help to get there. But once you start playing, the games themselves are engaging and simple. The first one is an engaging “I Spy” activity that’s good for vocabulary development.
I’ve placed the link on my Geography page.