The rivers aren't too terribly bad. The very long river in the center appears to have two different rivers that flow into the ocean in the south. Also, there is a large amount of inland seas. There are some real world examples of lakes not connecting to the sea, but I don't know if two of them, that close together would work.

I like the shape of the continent, and I like the symbols a lot. It is a good start, and I think it has a lot of potential.