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Touch spells typically either specify the target that you touch (i.e. Magic Weapon) or involve a spell attack where the rules of targeting are governed by the chapter on spellcasting:

Some spells can target only a creature (including you) that you touch.

Forbiddance doesn't specify what you touch or whether you must. How do I cast this spell? What do I target?

Range touch [...] You create a ward against magical travel that protects up to 40,000 square feet of floor space to a height of 30 feet above the floor. For the Duration, creatures can't teleport into the area or use portals...

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Based on the description you have provided:

You create a ward against magical travel that protects up to 40,000 square feet of floor space to a height of 30 feet above the floor.

I would say that, since the spell's dimensions are derived from the floor, then the floor would be what you touch when casting it. It would be up to the DM on whether you had to trace the outlines of the spell or simply had to concentrate on the area of the floor that would become the center of the effect.

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    \$\begingroup\$ Other spells allow for determining area of effect size without having to physically trace it so I think there is compelling reason to think that you are correct and that only touching the floor is really necessary. \$\endgroup\$ – Rubiksmoose Feb 16 '18 at 18:59
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You have to touch at least the outlines of the area it will affect

Under Casting Spells in the PHB it says :

Range

The target of a spell must be within the spell's range.

The range of this spell is Touch and therefore you must have touched the area to be affected. This is why they give it a ten minute casting time.

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    \$\begingroup\$ Forbiddance does not prevent someone from entering an area, only Planar Travel into that area, such as teleportation, portals, Plane Shift spell, or Summoning. \$\endgroup\$ – SeraphsWrath Feb 16 '18 at 17:54
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    \$\begingroup\$ @SeraphsWrath you are correct I thought he was asking about Guards and Wards which has an almost identical casting process. \$\endgroup\$ – Voromir Kadien Feb 16 '18 at 18:10
  • \$\begingroup\$ Could you provide some sort of justification for why you think that touching everything is the answer? Generally, answers must be supported by some sort of evidence. \$\endgroup\$ – Rubiksmoose Feb 16 '18 at 18:42

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