| Creatures: | Ytrams, Wahrks, Sunners, Beetles and other animals; also a kind of Fishes. |
| Geography: | Once an island, now broken to a group of five islands inter-connected using magnetic levitation ('mag-lev') vehicles; steam pipes also distribute energy |
| Inhabitants: | Humans, known as Rivenese |
| Vegetation: | Tall trees, grass, flowers, forming tropical jungles. |
| Written by: | Gehn |
As Gehn numbers his ages instead of giving them names, he actually refers to Riven as 'The Fifth Age'. A lot of references to the number five can be found on the islands, including pentagon-shaped architecture. This is also due to Gehn overrating the importance of the number 'five' in the D'ni society. Riven is another example of the instability of Gehn's ages, as the island drift apart over time, forcing Gehn to replace the old ground paths (cf. RAWA's page explaining the east path) with his mag-lev trains, a more flexible approach to connect the island with each other. In the Riven end game, however, the island finally collapses, the natives refuging to Tay as suggested by Katran (who follows Atrus instead).