river shedn. an area or ridge of land that separates waters flowing to different rivers or river basins; cf. watershedn.1 1.
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1882 R. L. StevensonMerry Men in Cornhill Mag. June ii. 686 Looking down the river shed and abroad on the fat lowlands.
1991 R. Krueger et al. This Land of Ours vi. 208/1 In Canada dams have been used widely for another purpose: to transfer water from one rivershed to another.