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IT all depends on how you define region. ~~Columbia~~ Colombia is the most highly biodiverse country on the planet, but the fact that it has Andes mountain regions, pacific coastal regions, amazon rain forest regions, caribbean coastal regions, inland plain regions and ocean island regions helps. It also has the highest number of endemic species of any other country (IE, species that do not exist in other countries)
Given that ~~columbia~~ Colombia as a whole occupies less territory than the amazon rain forest or river basin, a valid argument could be made that it is the most biodiverse environment on the planet.
On the other hand, in terms of species per random square meter of land, I think coral reefs and tropical rain forests (BTW, there is no significant measured change in biodiversity from rain forests to rain forests . Tropical rain forests have, overall, similar bio diversities. Although the amazon rain forest is the largest, there are huge rain forests in africa and india, as well as the southwestern pacific including myanmar, papua new guinea, etc.) compete well with each other here, though i’ve seen a paper that suggests grasslands are more biodiverse on this scale than jungles. This is rendered more difficult to judge because not all species for rain forests have been catalogued.
Anyway. It’s a good picture and all.
Edit: Due to a temporary explosive brain aneurysm, though thankfully in a very small specific region of my brain that stores the spelling of South American countries, i spelled Colombia with a U. The good news is, with proper therapy and rehabilitation, there is hope for a full and speedy recovery.