riv ière ▁à ▁Mars ); ▁▁ ▁towards ▁the ▁north , ▁passing ▁between ▁two ▁mountains ▁and ▁forming ▁a ▁hook ▁of ▁ ▁towards ▁the ▁west , ▁until ▁the ▁dis charge ▁( coming ▁from ▁the ▁south - east ) ▁from ▁Lac ▁No ir ; ▁▁ ▁north ▁in ▁a ▁deep ▁valley , ▁to ▁a ▁b end ▁in ▁the ▁river ; ▁▁ ▁towards ▁the ▁north - west ▁by ▁forming ▁a ▁hook ▁of ▁ ▁towards ▁the ▁north , ▁up ▁to ▁the ▁out let ▁( coming ▁from ▁the ▁south ) ▁of ▁" L ac ▁du ▁Port age "; ▁▁ ▁to ▁the ▁north , ▁collect ing ▁the ▁out let ▁( coming ▁from ▁the ▁east ) ▁of ▁Lac ▁Vert , ▁the ▁out let ▁( coming ▁from ▁the ▁east ) ▁of ▁" P et it ▁lac ▁Cast ule " ▁and ▁" Gr and ▁lac ▁Cast ule ", ▁branch ing ▁off ▁towards ▁n ortheast , ▁to ▁the ▁confl u ence ▁of ▁the ▁Bras ▁d ' Is a ï e ▁( coming ▁from ▁the ▁west ); ▁ ▁Lower ▁course ▁of ▁the ▁rivière ▁à ▁Mars ▁( segment ▁of ▁ ▁in ▁forest ▁area ) ▁▁▁ ▁east wards ▁to ▁the ▁confl u ence ▁of ▁the ▁Bras ▁du ▁C oco ▁( coming ▁from ▁the ▁south - east ) ▁▁ ▁north - west ▁to ▁the ▁out let ▁( coming ▁from ▁the ▁east ) ▁of ▁Lake ▁Como ; ▁▁ ▁towards ▁the ▁north - west ▁crossing ▁some ▁rap ids ▁until ▁the ▁confl u ence ▁of ▁the ▁La ▁Gros se ▁Dé charge ▁( coming ▁from ▁the ▁west ); ▁▁ ▁towards ▁the ▁north -