The difference between Canyon and Dalles
When used as nouns, canyon means a valley, especially a long, narrow, steep valley, cut in rock by a river, whereas dalles means the rapids in a deep, narrow stream confined between the rock walls of a canyon or gorge.
check bellow for the other definitions of Canyon and Dalles
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Canyon as a noun:
A valley, especially a long, narrow, steep valley, cut in rock by a river.
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Dalles as a noun (pluralonly):
The rapids in a deep, narrow stream confined between the rock walls of a canyon or gorge.
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Dalles as a noun (pluralonly):
A steep-sided part of a stream channel, near the dalles proper, marked by clefts, ravines, or gorges.