Literally, "the shore of the crystal sea" can be understood as being surrounded by a crystal clear sea, which may represent a pure and flawless spiritual world or the residence of the gods. "Shore" implies the edge or critical point of this realm, and may imply the boundary or boundary of life or soul existing in this realm.
In the context of poetry (holy trinity), "around the shore of the crystal sea" may be a kind of praise and admiration for the gods, indicating their supreme power and sacred worship. This expression may also describe a state of spiritual experience or illusion, which makes people feel the existence of God and transcend the secular realm.
In a word, the meaning of "the area along the Crystal Sea" may vary from person to person, and the specific explanation may need to be judged according to the creative background of the poem, the author's intention and personal beliefs and experiences.