pure water; clear water
Often used in poetic or literary descriptions of pristine natural water, such as a mountain spring or a clear stream. The prefix 真 (ま) adds a sense of genuine, untainted purity.
I quenched my thirst with the pure water deep in the mountains.
Clear water springs forth in this land.
Compound of 真 (ま, 'true, pure') and 清水 (しみず, 'clear water, spring water'). The prefix 真 intensifies the meaning, yielding 'truly pure water'.