Thailand is a country where people's appearances truly differ by region

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Not to mention Korea,
but even compared to China, which is a much larger country, the perceived difference in appearance by region seems even greater (excluding Uyghurs).
If you look at the map, Northern Thailand, centered around Chiang Mai, looks more similar to people from Southern China rather than Southeast Asian indigenous people.
Of course, I don't mean they look exactly like Northeast Asians.
Also, the Northeast of Thailand is called the Isan region,
and in the Isan region, appearances change subtly as you move toward the North, Central, and South.
Areas like Udon Thani and Nakhon Phanom also feel like they have a bit of Chinese blood mixed in.
There is almost no difference from the North, but they have a slightly stronger Southeast Asian feel.
And in Central Thailand, it's hard to pinpoint Bangkok because it's such a melting pot of many ethnicities.
What's certain is that many people with sophisticated looks have migrated to Bangkok. There are also many Thai-Chinese people here.
If you go to Ayutthaya, north of Bangkok, the appearance is quite unique;
here, the local Thai feel becomes much stronger than the Chinese influence,
yet there is still a faint hint of Northeast Asian features.
Some might have eyes that look Mongolian, while others might look like Japanese people with tanned skin.
There is a player named Sasi Phaporn in the Thai women's national volleyball team. She is exactly the Ayutthaya style.
And then, the southern Isan areas like Buriram and Sisaket, and the Southeast areas like Pattaya and Rayong,
really have a strong indigenous Thai feel.
Southern Thailand, such as Phuket and Songkhla, also has a strong Southeast Asian indigenous feel,
but there is a subtle difference between the two. The South is somewhat similar to Malay indigenous people, so they have a softer impression.
Thailand is a very interesting country in many ways, with diverse food, diverse ethnicities, and diverse gender identities.