觀無量壽佛經義疏 2.107

2.107

「『次當想水。欲想水者。極樂國土有八池水。』」一國八池，渠道相通。二、明水色。

"‘Next, one should visualize water. For those who wish to visualize water: the land of Sukhāvatī has the waters of eight ponds.’" There are eight ponds in one land, and the water channels interconnect. Second, explaining the color of the water.