Name all countries where at least part of the territory is naturally covered by tropical rainforest
Not including overseas territories or regions
Based on a combination of these two maps: https://en.wikipedia.org/wiki/Köppen_climate_classification#/media/File:Köppen-Geiger_Climate_Classification_Map.png and https://en.wikipedia.org/wiki/Tropical_and_subtropical_moist_broadleaf_forests
Drawing a boundary between what is a rainforest and what is not is difficult. However, this is the closest I could get.