While your rivers are much better in this map than in Sudria's map, it is kind of odd that you have a mountain range right on the southern coast, that prevents any rivers from reaching the southern coast, though that is not an impossible geologic feature. Study this map to learn what to do for rivers on your other map.
Same argument, as Sudria, regarding the name's meaning. To call one land the Land of the Whites and the other the Land of the Blacks, seem to indicate a third people somewhere that is naming all these ethnically describing names. Just as Sudrians, wouldn't call themselves "blacks", Nodrians wouldn't call themselves "white" - both would call themselves "normal", and everyone else by color.
So I'm starting to wonder who the people are that are naming these continents?
Also notable are any lands with the "ia" at the end, sounds very Roman or European. For example Romans name the lands of the teutonic peoples Germania, but the Germans never called themselves that, nor do most call themselves Germans, now. This is a Roman name for them only. Nations with names ending in "ia" generally are given by outsiders.