Central/South America has a lot of 100-130 V too, I believe, but I don't have direct personal experience.

I find the standard voltages pretty interesting. The 230 V standard, for example, is mostly a lie. In reality, Britain and former British colonies tend to run on 240 V, and continental Europe/Asia/Africa tends to run on 220 V. The 230 V standard includes wide enough tolerances so that no one needed to actually change anything. I've never actually seen 230 V, the supposed standard, in real life.

Be careful in Montserrat: US plugs but UK voltage (!)