Today's prompt was 'waterfall'. This particular sketch really needed some color...

Alrightee then, how about D100 Space Adventure? Especially Quick and Dirty Stars and Worlds, with d100 land plus d100 ocean, so we would have a surface area from 2% to 200% of Earth's surface area, which is roughly 10 million to a billion km^2. This doesn't get me some quick and dirty landmass and seas, just raw surface area and a ratio of land to sea. If we go with my trusty octa-sphere, we could make a square which is circumference/1000 km across, (circ/1k)^2 quads which become that many triangle pairs, (circ/1k)^2*2. Or a classic 20 sider which we can think of as ten squares turned diagonal and stretched a bit, each (circ/1k)^2, so a lot more triangles with smaller areas and more headaches!