Encyclopedia Barsoomia Wiki

The River Syl is an underground river on Barsoom.


The river is situated in a massive underground cavern, where unmined radium particles give off a dim light. A unique ecosystem survives (possibly thrives) because of this, with unique plants and animals life not common upon Barsoom including fish that swim within the river, and the Great White Lizard that hunts down Red Martians sentenced to Tjanath's "Death".

The river continues above ground in the Valley Hohr.


For a long time the people of the city Tjanath would dispose of their criminals by placing them into a cage, then slowly lowering them into a pit that they perceived as being somewhat bottomless, from this pit emanated constant moans that they thought were the slowly dying people they had sentenced to this punishment that they affectionately called "the Death".


  • The River Syl is possibly an underground tributary of the River Iss.