Yes, I was aware of the problem with my rivers even as I was submitting the map, rationalizing for their wayward behaviour with out-of-the-box explanations, such as "sinking into limestone caverns" or simply "evaporating." Normally, I would prevent this from occurring by ensuring the complete absence of tiny inland lakes, for the "Fill Basins" function in Wilbur doesn't fill these in. As it happens, when I run the "Incise Flow" function, even a lake measuring one pixel in area will result in a misrouted river. I'll certainly mind these tiny lakes in my next submission. Be the way, how are the flood plains? I tried to use the "Remap Altitudes" function to level off some of the topography, to create more flat areas, as Pixie suggested for my last map. I'm right now working on a major project, and I'll definitely keep all your suggestions in mind. Thank you for your criticism.