Vearth

Vearth (大地 (ヴァース), Vāsu, Great Earth (Kanji), Varse in the Viz Manga and FUNimation edited dub) is the name that the people of Skypiea call the dirt found on Upper Yard. Because Upper Yard is the only place in Skypiea where Vearth can be found, it is a sacred substance. Before the Skypiea Arc, the Shandian Aisa would usually sneak into Upper Yard and fill up her bag with Vearth, bringing it back home with her.

Vearth is actually just parts of the island Jaya, that was shot up to Skypiea when the Knock Up Stream came from beneath Jaya.

Fairy Vearth
Fairy Vearth (限りない大地, (フェアリーヴァース) Endless Great Earth" (Kanji) Fearī Vāsu, Endless Vearth in the FUNimation dub and Endless Varse in the Viz Manga) is a legendary land to which Enel wanted to travel after destroying Skypiea.

After his defeat by Luffy, Enel heads off to Fairy Vearth, which turns out to be the Moon. On Fairy Vearth, Enel finds a group of alien like creatures who have wings like the Skypieans.

The discrepancy in translation ("Endless" Vs "Fairy") is because both are actually written in the manga. The Kanji written lists it as "Endless Great Earth" while the Furigana reading is for "Fairy Vearth", meaning technically, both are correct.