Martha Brae is a river found mostly in the northern part of Jamaica. With its 32 kilometers in length, this river is the main rafting attraction of the island. You'll traverse 3 miles of the river on thirty foot long bamboo rafts, on which you can learn about the legend of Martha Brae or enjoy an exhilarating swim. A small village west of the river is called Martha's Brae due to its proximity to the river.