Quicksand/ Quicksand Rivers

Quicksand would act similar to powder snow, except sprinting across it would give the player immunity to sinking. Quicksand rivers could form in the desert and boats can be used to go across. Quicksand would also form on certain beaches, bordering the water. Quicksand could also appear in swamps and jungles, taking on a darker color closer to mud. These puddles could cover up cave entrances.