It shows a water droplet combined with a t-shirt, with the caption suggesting that "smart people" will be able to figure out the name of a country in 5 seconds.

The answer to this riddle is "Thailand".

Here’s the reasoning:

• Water droplet = "Thai" (as in the sound "th" from "thai" in Thai water or liquid).
• T-shirt = "Land" (as "land" is part of the word "Thailand").

So, combining "Thai" + "Land" gives us Thailand, which is a country in Southeast Asia.

It’s a clever use of visuals to represent the country’s name!