Raise Land

Raise Land FT&S p37 8th-level abjuration Casting Time: 24 hours Range: Touch Components: V, S, M (an exotic feather and a diamond worth at least 2,500 gp, which the spell consumes) Duration: Until dispelled Upon the completion of this spell, the land beneath you and whatever else may be on that land slowly rises skyward, reaching 100 feet into the air after 10 minutes. The area affected by this spell can have a radius up to 1,250 feet, and the spell fails if the radius includes an area already under the effects of a different casting of this spell.
  While standing on a piece of land affected by a raise land spell that you have cast, you can use your action to cause the landmass to move up to 50 feet in a direction you choose. The landmass ceases to move if it impacts any object.
  If this spell is dispelled, the mass of land formerly affected descends slowly at a rate of 10 feet per minute. A dispelled landmass may float or sink in water, at your DM's discretion, and impacting the ground even at a slow speed may cause damage to structures or creatures on the landmass.
  At Higher Levels. When you cast this spell using a 9th level spell slot, the radius affected by this spell increases to 5,000 feet. Classes: Bard, Cleric, Druid, Sorcerer, Warlock, Wizard Note: Both the Fighter (Eldritch Knight) and the Rogue (Arcane Trickster) spell lists include all Wizard spells. Spells of 5th level or higher may be cast with the aid of a spell scroll or similar. Source: FT&S, page 37