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Real world geology: Greyhawk
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<blockquote data-quote="Maldin" data-source="post: 3569467" data-attributes="member: 27170"><p>A branching river is not the same thing as two truly-separate outflows because, in all cases, the branches have the same slope, almost immediately rejoin, and at a exactly the same elevation. The two flows together are actually behaving as a single unit of flow as they have the exact same end point and "base level" (the elevation to which the river is trying to erode to). Any other situation is either manmade (and maintained), or VERY temporary, as the two outflows will invariably erode at different rates and the outflow with the greater rate of erosion (no matter how slight) will always capture the entire flow eventually.</p><p></p><p>So... the quick answer? Its an impossible geographic situation. Ok. Gary Gygax was not a geologist or geographer, and I'm not going to hold it against him. Can we try to explain it? You betcha!! Its magic! Ok. I'm not being fair, especially after the post I just made over in the "<a href="http://www.enworld.org/forums/showthread.php?t=198261&page=2" target="_blank">Poll: Fantasy world maps and real world geology</a>" thread! But the two outflows of the Nyr Dyv certainly <strong>is</strong> an example of a situation that merits this kind of attention, so I actually did come up with an explanation using the dimensional distortions that sank the Isles of Woe. Check out the "Addendum: The Geography of a Cataclysm" section at the bottom of my <a href="http://melkot.com/mysteries/woe.html" target="_blank">The Isles of Woe</a> webpage for a more detailed explanation that you may or may not find believable. <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin :D" data-smilie="8"data-shortname=":D" /> </p><p></p><p>Denis, aka "Maldin"</p><p>Maldin's Greyhawk <a href="http://melkot.com" target="_blank">http://melkot.com</a></p></blockquote><p></p>
[QUOTE="Maldin, post: 3569467, member: 27170"] A branching river is not the same thing as two truly-separate outflows because, in all cases, the branches have the same slope, almost immediately rejoin, and at a exactly the same elevation. The two flows together are actually behaving as a single unit of flow as they have the exact same end point and "base level" (the elevation to which the river is trying to erode to). Any other situation is either manmade (and maintained), or VERY temporary, as the two outflows will invariably erode at different rates and the outflow with the greater rate of erosion (no matter how slight) will always capture the entire flow eventually. So... the quick answer? Its an impossible geographic situation. Ok. Gary Gygax was not a geologist or geographer, and I'm not going to hold it against him. Can we try to explain it? You betcha!! Its magic! Ok. I'm not being fair, especially after the post I just made over in the "[URL=http://www.enworld.org/forums/showthread.php?t=198261&page=2]Poll: Fantasy world maps and real world geology[/URL]" thread! But the two outflows of the Nyr Dyv certainly [B]is[/B] an example of a situation that merits this kind of attention, so I actually did come up with an explanation using the dimensional distortions that sank the Isles of Woe. Check out the "Addendum: The Geography of a Cataclysm" section at the bottom of my [URL=http://melkot.com/mysteries/woe.html]The Isles of Woe[/URL] webpage for a more detailed explanation that you may or may not find believable. :D Denis, aka "Maldin" Maldin's Greyhawk [url]http://melkot.com[/url] [/QUOTE]
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