From Final Fantasy Wiki

"Long ago, peace returned to this tumultuous land, and Lilties kept the highways safe. At long last, travelers walked the roads without fear of monsters. The Yukes constructed a great sluice to channel water down from Lake Shell, transforming Jeagon creek into a great river. Over time, the river turned the vast plains of Fum into farmland, thereby providing food to people the world over. To us, this sluice is more important than anything."

—Narration, Final Fantasy Crystal Chronicles

Veo Lu Sluice.

The Veo Lu Sluice is a gigantic water table from Final Fantasy Crystal Chronicles set in the northern part of the continent, near the city of Shella. This complex is the single source of water for the Jegon River, which feeds the rest of the continent. The Sluice is operated by native pumpflowers, which have an unfortunate tendency to wither, thereby drying up most of the Jegon River. These flowers require some maintenance to keep healthy. The Sluice is also home to Lizard Men, flans, and Gigan Toads. The sluice is guarded by a Golem, which has many the strong attacks to hit, freeze, light aflame, or knock you back with, all to hit anything humanoid or soft and fluffy.

Trivia

The music from Veo Lu Sluice appears in Final Fantasy Crystal Chronicles: The Crystal Bearers.