I used this at work; while waiting for builds to complete I would use Anki [0] to learn all the names and locations of the countries. It worked pretty well, but it isn't a silver bullet. I retained maybe 50% of the information.
I found it really motivating to see the message that a card will appear again in 4 or 7 years! But i never got beyond a year of actually using a deck...
What deck(s) do you use? I've been looking for a deck that ideally has one side where there is an image of the country, and I give it the name, and another where there is the name of the country and I click on it in an image, but it's hard to find such a deck.
Some people swear that the process of making the deck helps significantly with their ability to retain the material.
Personally I find it a waste of time and all time spent editing cards is a waste to me. It doesn't help me. Learning traditionally (taking notes, answering practice questions, etc) from books and reviewing with Anki is the most effective for me.
Ymmv but when building a deck creating mnemonics for each item was really important for me. Made it a lot slower to enter data but much more fun and much more effective in later use.
I found mnemonics to really only be useful when you're in the beginner stage. Once I got up to intermediate real world usage was much more helpful and easier to remember since I didn't have to remember a completely unrelated thing along with what I wanted to learn.
The highest rated geography decks was what I used [0]. But yeah finding good quality decks is the hard part, though the geography ones generally do have pictures of the country and you guess the name.
[0] http://ankisrs.net/