Corrections in red. Stylistics in blue.
What is Siberia? Do you know?
I am originally [1] from a small town in Siberia. It's really small, and there is nothing interesting there, but I'm happy to have been born there.
I am proud of the [2] people of my homeland. They just do their job - they extract oil and never cry.
Actually Siberia is a very large region with beautiful, wild nature. We have forests, endless marshes, great rivers, and the world largest freshwater lake, Lake Baikal.
[1] I have the impression from your comment to Nelson, and from your later use of the word "there" that you no longer live in the small village where you were born. I therefore added the word "originally" to make it clear that you now live somewhere else.
[2] You wrote "dour" which is a word which means stern; obstinate; also: ill-humored; gloomy; so maybe you didn't mean that. Or did you? If you did, then you need the article "the" -- "I am proud of the dour people......" Perhaps you meant to write "our", not "dour"? If so, the sentence sounds more natural with a simple "the".
What is Siberia do you know what Sibera is?
I am from a small town in Siberia. It's really small and there is nothing interesting there but I'm happy to have been born there.
I proud of dour (my) people and of my homeland. They just do their job - they extract oil and never cry.
Actually Siberia is a very large region with beautiful wilderness nature. We have forests, endless marshes, great rivers, the world largest lake, Lake Baikal.