Issues with the geomorphology of Middle-earth include mountain ranges that join at right angles, rivers that run parallel to mountain ranges, drainage basins not separated by high ground, and a river delta that flows into another river. Based on Acks, Alex (1 August 2017a). Tolkien's Map and The Messed Up Mountains of Middle-earth. Tor.com. and Acks, Alex (10 October 2017b). Tolkien's Map and the Perplexing River Systems of Middle-earth. Tor.com.
Own work This file was derived from: Sketch Map of Middle-earth.svg:  by Chiswick Chap
Ian Alexander