@Mateo Monsalve
This is a difficult question to answer because we don't know what your objectives are. So, the best I can do is tell you where I find interesting options that fit with my objectives. I'm an investor and I'm looking for the best possible risk-adjusted returns so you and other readers might have the same objectives.
I'm only interested in STRs for maximum profitability and because the other strategies generally aren't worth it. So I'm looking for the combination of affordable properties (cheap could be misinterpreted) and (mass) tourism. Thankfully, and it's no coïncidence, the places where I end up investing are great for lifestyle.
My pricing criteria eliminates Canada, Northern Europe and Oceania.
My tourism criteria eliminates Africa.
I eliminate Asia, including and up to the Middle East because, in most countries, foreign owners are treated second-class and that has serious implications from a risk point of view. As mentioned by @Bruce Lynn, Thailand is a great example. It'a cheap for a reason (although a lot of the stuff promoted to foreign investors looks cheap but is in fact expensive). Japan is an exception but, aside from exceptional cases, it's the last place where I'd invest since, unlike in the rest of the world, properties depreciate over time until they get destroyed.
I eliminate the Caribbean because of the sargassum.
What do I have left over? The two areas where I invest, unsurprisingly.
1. Latin America
There are several countries that would work but Mexico beats all of them hands down. Tourism, remote workers, digital nomads, snowbirds, retirees, near shoring induced economic boom, growing middle class, massive population (growth) and geographical location. No other country in the region can compete. There's no contest, although some other countries could work as well in specific niches. This is why a lot, if not most of my 1,250+ post replies in the forum to date are about Mexico, as many investors seem to agree. Beware of the Caribbean side though (see above).
2. Southern Europe
Southern Europe is what Mexico is to Northern Europeans, with the nuance that Southern Europe is full-fledged developed so it's mora a mix between Florida and Mexico with a weather more akin to California. Again, you can't beat the location inside the huge European market.
Of course, that's what's available to you but you need to either know what you're doing or have access to the necessary people and resources, in case that isn't obvious.
Hope this helps!