From what I remember it takes place in some type of Turkic country. Two kings of neighboring lands decide to do a marriage exchange where the smartest man of one country will marry the most beautiful woman of the other country. The kings secretly switch them out with a cat and a dog but the two people in question find each other.

It's a really cute series, does anyone know it?

I clearly remember reading this beautiful, heartwarming story, but also can't remember neither its title, nor where exactly I were reading it.
Wasn't it on Webtoon?

Some more details about the story:

• FL was a princess and a little chubby, she wasn't as favoured as her sisters, other princesses of that kingdom, so she lived not in a palace, but somewhere on the countryside, maybe even close to the border with that neighboring country.
• She wasn't upset with her situation though, on the contrary, she enjoyed her calm and quiet life with a granny (don't remember, was it her actual grandmother or just a nanny), she also loved granny's cooking
• If I remember correctly, her soon to be husband was a commoner from the neighboring country. I guess, his king picked him accidentally, on a whim. We know that both kings weren't actually serious about this marriage and planned to trick each other by sending animals anyway
• There was something about lack of water in one country, while the other one had no problems with it. Also, I remember stuff about one of the countries becoming rich and living in prosperity, because there was a lot of trading paths, going through their lands, though I may be wrong about this one.

I found it!! It's called Kin no Kuni, Mizu no Kuni https://mangadex.org/title/4beb73b3-13c8-4b2a-8bbc-8e42514b3b38/kin-no-kuni-mizu-no-kuni

Oh, that's great! Time to re-read it then )

Thanks god, it wasn't actually something from Webtoon Canvas, as I thought for some reason, because finding it there would've been almost impossable thing to do.
Now, looking at the categories it labeled with, Kin no Kuni Mizu no Kuni, I probably stumbled upon it while looking for stories with not slim female leads at someone's request about a year ago (maybe I even still have that list somewhere). How come I didn't add this wholesome thing to my follows back then? Silly me.

Thank you very much for reminding about this manga's existence! (❁´◡`❁)