This low rez version doesn't show it, and I'll definitely have to fix that, but the rivers are linked by canals. The original authors maps had interconnected rivers and I tried to keep as true to that as possible as most of the regions travel is through riverboats. As to the mountains, using my knowledge of geography (degree in geography with an emphasis in cartography and GIS) I found a way to justify his weird geography with only minor adjustments. So trust me that while unusual the tectonics are plausible ( I took his information and basic map, then found a way to actually justify the placement of his features with weather patterns, water currents, and tectonics). It was a pain, and in the end I figured the world to be about 2/3 the size of earth with a higher average mass, and slightly lower gravity.