The "Tama River," actually the Tama River Aqueduct, carried much of the drinking water for the city of Edo along a thirty-mile course. Hiroshige's springtime view vividly conveys a freshness and vitality befitting this lifeline. The cherry trees were planted along much of the embankment in the 1730s. The placement was not only aesthetic but also practical: the trees' roots strengthened the banks, and their petals and leaves were thought to possess antitoxic powers that kept the water pure.