I need some help with my first map

[Hai-Etlik]

Thanks again for the help Hai, you're a really good guy

One more thing, can you tell where a lake forms? Is it only where multiple rivers join or it is about the topography of the land?

A lake occurs when there's a basin to hold it. If there's a nice downhill gradient, water will flow down it taking the best path, and you have a river. Sometimes it flows down into a basin with no downhill route out from it, and it builds up. Eventually it reaches a point where it can flow out and you get a river. This means you have to consider the shape of the terrain. Mountain lakes tend to be spidery, spindly shapes filling the valleys between the mountains while lakes on plains are more compact.

There are a few lakes that are "Endorheic". The Dead Sea, Aral Sea, Caspian Sea, and Great Salt Lake are all examples. These have no river outlet. Water flows in, and then evaporates. They only occur in quite dry conditions, usually well inland. There are also a few rivers that just spread out over a flood plain and evaporate without flowing into a lake or ocean.