I don't know about the lakes... rivers and streams there can be quite a lot - I just have to leave my house to find a dozen little brooks that you can jump over. But for a stream to form a lake should not be so common.

Woods look very nice with the streams going through them. Hills also. The mointain in the middle might be a little to spotty, regarding the scale.

What I think does not fit at all is your coastal water. Perhaps you should blend it outward? Or convert it to mist and clouds, to shroud the wizard's island!