Korean geography (This writing is for speaking test)

Korean geography (This writing is for speaking test)

Korea is a peninsular country. It's fishing business is very well developed
So Korea and has exported seafood around the world for a long time.
Among them, Korean oysters is are among the best in the world.
In Korea, there are also many mountains.
The tallest mountain is BACK-DO Mmountatin in North Korea.
Sadly, as you know , Korea is divided into two nations countries:The north and The south.
I’ve never been there, I just saw to BACK-DO mountatin but I have seen it on TV .
If I have the chance, I’d like to go there.
And The second tallest mountain is Halla mountain on Jeju island.
Jeju island is famous for being the most popular tourist attraction in South Korea. 
So People go there for their family trips or their honeymoon.
When I go there, Of course I can see a lot of Koreans but at the same time I can see a lot of people from many different countries.
There are many luxurious hotels, nice restaurants and beautiful beaches.  Also, There are many something to do such as hiking, rock-climbing , horse riding and so on.
It’s truly heaven on the earth.
This is These are the reasons people go there come every year.
Also, There are many something to do such as hiking, rock-climbing , horse riding and so on.
Because there are many mountains in Korea, hiking is one of the most popular activities.
On the weekends, I can easily see many people wearing climbing suit gear on the street.
When it comes to rivers, in korea there is a very big river called the Han river.  The Han flows through Seoul from east to west..
I don’t know much about the lakes in Koreaabout lake well, but the only thing I know is that I heard there is a big lake near Il-san, which is very close to Seoul.

Hey, good job.  I just reorganized a sentence or two.  Watch out for capitalization, make sure you have it at the beginning of sentences and for all proper nouns.