Every sacred space implies a hierophany, an irruption of the sacred that results in detaching a territory from the surrounding cosmic milieu and making it qualitatively different.
Eliade establishes the definitive structural formula: sacred space is constituted by hierophany, which sunders a portion of cosmos from homogeneous profane surroundings and renders it a threshold between modes of being.
, The Sacred and the Profane: The Nature of Religion, 1957thesis