Gotta agree with Just Some Guy here. I loved Risk in my youth, but that was before I played many better games. Risk 2210 is an improvement, but since it’s set in the future, the map is different and so may not scratch that Geography itch. (One of the good points of the original Risk is that I know where Kamchatca is). The downsides of Risk are many, but the major ones are: huge dependence on luck, long play time, and hurt feelings due to extreme conflict.
Here are some games that share some of the good points of Risk without the bad that I’d be happy to give a 9-year-old:
Geography related:
TransAmerica (and TransEuropa): Building train routes across the country (or Europe) to connect up your 5 cities faster than anyone else. (Plays fast (30 mins), simple rules, inexpensive)
Ticket To Ride (or Ticket to Ride Europe): Similarly, a train-based game, but longer and slightly more complex. Collect train cards Rummy-style and play them in sets to claim tracks on the board.
Battle/Conflict related:
Nexus Ops: Risk-like, but with a sci-fi theme, and better, more balanced rules and shorter play time. (Available for $10 or under in some Toys R’ Us and online stores. They are discontinued and clearancing out)
Vinci: This may be a bit advanced, or he may have no trouble with it. You conquer a map of Europe, like Risk, but without any luck. Empires rise and fall, as you abandon declining empires and restart elsewhere on the board with new powers. Play time is under 2 hours. (Sadly, it’s out of print, so Ebay may be the best place to find it.)
(And I do love HeroScape as well, but be warned, constant expansions make it either a great, reliable present idea, or a money-sink, depending on how you look at it.)
If he just likes rolling lots of dice:
Can’t Stop: classic push your luck game, recently republished. Plays in 30 minutes.
I definitely recommend checking out www.boardgamegeek.com. Post the same question there in the Recommendations forum and you’ll get ten times the options.
(Most of these games won’t be found at your local toy store. You may need to find a specialty Game store near you, or go online to: www.thoughthammer.com, www.funagain.com, or www.bouldergames.com, all of which I’ve ordered from in the past with no problems.)