Sankaku Channel/rei no pool

"Infamous" pool, featuerd in many JAVs.
In Japanese, the pool is called "that pool" (あのプール or ano puuru) or "the usual pool" (例のプール or rei no puuru).
More information here:
http://kotaku.com/the-most-infamous-swimming-pool-in-japanese-pornography-1520473085

Alias: the_pool