Also, how about rivers, really big rivers (or more likely river). Perhaps you have something like the Columbia River or the Nile, except that it's 20-50 km wide and several thousand miles long. For extra fun, what if it (or perhaps another slightly less huge river) suddenly vanishes, going over a vast waterfall, into a huge hole deep into the earth. The hole is big enough to lower ropes into and not get washed away definitely appears to have been bored into the Earth (although, it would now be very worn). No one has made it more than half a mile down into the hole, and throwing lights down there reveals that the hole goes for a long way down. What might be down there?
For other riverine fun, you could have a braided river. Instead of tributaries flowing into a single large river that then fans out into a delta at the coast, how about tributaries that come together into several rivers that then intersect, branch apart and create dozens or hundreds of islands several miles across in the midst of a huge network of rivers.
You could also have some sort of weird Underdark created using effectively eternal lights, strangely engineered life-forms, and an underground sea, possibly complete with retro-engineered dinosaurs.
Also, how about some huge floating balloon cities, even better, what if some or all of these cities are alive. The buildings are of wood (engineered to include carbon nanotubes and suchlike to strength) and the upper surface is green and is effectively one huge leaf (the lower half would be transparent. In some, the difference between floating city and floating jungle would definitely blur.
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Also, how about rivers, really big rivers (or more likely river). Perhaps you have something like the Columbia River or the Nile, except that it's 20-50 km wide and several thousand miles long. For extra fun, what if it (or perhaps another slightly less huge river) suddenly vanishes, going over a vast waterfall, into a huge hole deep into the earth. The hole is big enough to lower ropes into and not get washed away definitely appears to have been bored into the Earth (although, it would now be very worn). No one has made it more than half a mile down into the hole, and throwing lights down there reveals that the hole goes for a long way down. What might be down there?
For other riverine fun, you could have a braided river. Instead of tributaries flowing into a single large river that then fans out into a delta at the coast, how about tributaries that come together into several rivers that then intersect, branch apart and create dozens or hundreds of islands several miles across in the midst of a huge network of rivers.
You could also have some sort of weird Underdark created using effectively eternal lights, strangely engineered life-forms, and an underground sea, possibly complete with retro-engineered dinosaurs.
Also, how about some huge floating balloon cities, even better, what if some or all of these cities are alive. The buildings are of wood (engineered to include carbon nanotubes and suchlike to strength) and the upper surface is green and is effectively one huge leaf (the lower half would be transparent. In some, the difference between floating city and floating jungle would definitely blur.