A short description is given in the Sil:
Quote:
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Originally Posted by Of the begining of days
Behind the walls of the Pelori the Valar established their domain in that region which is called Valinor, and there were their houses, their gardens, and their towers. In that guarded land the Valar gathered great store of light and an the fairest things that were saved from the ruin; and many others yet fairer they made anew, and Valinor became more beautiful even than Middle-earth in the Spring of Arda; and it was blessed, for the Deathless dwelt there, and there naught faded nor withered, neither was there any stain upon flower or leaf in that land, nor any corruption or sickness in anything that lived; for the very stones and waters were hallowed.
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It seems that the place was quite large
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I would also speculate that Aman was quite fitting - besides Valinor, there was also Araman and Avathar; plus, Tol Eressea too was removed after the Akallabeth, "beyond the reach of Men". This could mean an alternate reality, whatever that is - perhaps something similar to the shadow world of the ringwraith; or it could simply mean a another planet in Ea.