Arm (geography)

In geography, an arm is a narrow extension, inlet, or smaller reach, of water flowing out from a much larger body of water, such as an ocean, a sea, or a lake. Although different geographically, a sound or bay may also be called an arm.
Both the tributary and distributary of a river are sometimes called an "arm". By extension, a "canal arm" is a subsidiary branch of a canal or inland waterway.