There is no definitive answer to this question as it depends on a number of factors, including the size and shape of the eyes, as well as the surrounding facial features. However, some countries are generally considered to have larger eyes than others.
Some of the countries with the largest eyes include China, Japan, and Korea. This is likely due in part to the fact that these countries have relatively small faces compared to other nations. This makes their eyes appear larger in proportion to their face size. Additionally, people from these cultures tend to have monolid eyelids (meaning they lack a crease in their eyelid), which also contributes to the illusion of larger eyes.
Other countries with large-eyed populations include Brazil and Thailand. Again, this may be due in part to smaller facial features relative to other nations. It's also worth noting that many people from these cultures have almond-shaped eyes, which tend to appear larger than round or oval-shaped ones.
So while there is no definitive answer as to which country has the biggest eyes, there are certainly several contenders for the title!