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Dharma Realm
The term Dharma Realm has at least three distinct meanings: 1) the enlightened world, that is, the totality or infinity of the realm of the Buddhas, 2) a particular plane of existence, as in the Ten Dharma Realms, and 3) the eighteenth of the Eighteen Sense-fields.

The Enlightened World
The Dharma Realm is just the One Mind. The Buddhas certify to this and accomplish their Dharma bodies.… “Inexhaustible, level, and equal is the Dharma Realm, in which the bodies of all Thus Come Ones pervade” .…

Going and returning without border,
Movement and stillness
have one source;
Embracing multitudes of words,
more remains,
Overstepping words and
thoughts by far:
This can only be the Dharma Realm! (EDR I 218)

A Particular Plane of Existence
“Dharma Realms pervade empty space to the bounds of the universe, but in general there are ten (ten dharma realms). There are four sagely Dharma Realms and six ordinary Dharma Realms.…These Ten Dharma Realms do not go beyond the current thought you are thinking.” (TD 57)

The Eighteenth Sense-field
In this technical sense of the term, dharma realm, or the field of dharmas, refers to 'object of mind'

See Also: 
Eighteen Realms ; Ten Dharma Realms