Literature
The Perak is mentioned in Rudyard Kipling's fantastic story The Crab That Played with the Sea (published as one of the Just So Stories). There, the man complains to his creator, the eldest magician, about the tides running into and out from the Perak: "Once a day and once a night the Sea runs up the Perak river and drives the sweet-water back into the forest, so that my house is made wet; once a day and once a night it runs down the river and draws all the water after it, so that there is nothing left but mud, and my canoe is upset."
Read more about this topic: Perak River