Some more additions to basic dungeons, should be able to get rivers and chasms in corridors:- e.g. if blue Cri = river, Cbr = river with bridge across. https://github.com/bluetyson/ADnD1e-Random-Dungeon-Generator
| B | B | C | O | C | B | B |
| B | Cri | C | C | C | Cbr | B |
| C | Cri | C | Cbr | C | Cbr | C |
| C | Cri | C | C | C | Cbr | C |
| C | Cri | C | B | C | Cbr | C |
| C | Cri | C | B | C | Cbr | C |
| C | Cri | B | B | B | Cbr | C |
| C | B | B | B | B | B | C |