Navigation is hindered by sandbars at the mouth and rapids upriver, though small, sea-going vessels can make fair headway up the Rejang in Sarawak and up the Kinabatangan in Sabah.
Vessels of any size can go up the Rejang.
mnli hypothesis: Vessels of any size can go up the Rejang. premise: Navigation is hindered by sandbars at the mouth and rapids upriver, though small, sea-going vessels can make fair headway up the Rejang in Sarawak and up the Kinabatangan in Sabah.