Arm (geography)

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Shuswap Lake in British Columbia with its three arms

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.

By extension, a canal arm is a subsidiary branch of a canal or inland waterway.

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