I would say Thailand. They seem to have more beauties per capita than in any other country. That is, if you like Asian women. They look extremely exotic, even much more exotic than the Japanese, Korean and Chinese women with whom we are most familiar. They are a mix of native Paleomongoloid types with quite a bit of Indian in them that came in quite a while ago. Also very long ago, about 900 years ago, a massive infusion of Chinese flooded into Thailand, contributing a huge part to the gene pool. So they are native Paleomongoloid (maybe Malay type) overlaid with an old Chinese layer and a rather smaller but still significant Indian layer.
The Indian element is interesting and combined with the Paleomongoloid base, probably contributes to their extreme exotic looks. However, the Indian element should not be ignored. Some Thai women almost look like Caucasians. But if they do, they often look like Indian Caucasoids. They look like a Punjabi or high caste woman for North India, very fair and light but with that Indian phenotype.
Sometimes I think these Thai men were geniuses deliberately breeding their women like livestock, culling the uglies and selectively breeding various strains of beauties to create a variety of total knockout gorgeous strains of women. There can be no other explanation for why they are so hot.
But Thai women are exotic as Hell. Even the total knockouts look very exotic and even a bit odd to a Westerner. Asians in general sort of look like aliens to us, but Thai women look the most alien of them all. But if Thai women are aliens, then they came from the Planet of the Beautiful Women!