Blue Horizon
Blue Horizon was a Federation planet terraformed by famed terraformer Professor Gideon Seyetik. His crowning achievement on the planet was the Da Vinci Falls. 

Commander Benjamin Sisko and his son Jake visited Blue Horizon on their way to Deep Space 9 in 2369. They spent a few hours on the surface, but didn't get the chance to see the Da Vinci Falls. ()

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Planets