The existence of all creation cannot be truly measured or comprehended by any human thought or intellect. The heretics have put boundaries on something that cannot be measured.
The sea is a picture of the world, the Torah and the Prophets are the rivers of living waters that nourishes the sea, the world. The different types of islands are the different types of churches, ones that protect people from the wrath of the sea and judgments of God by the doctrines of truth. As opposed to the islands or churches that are heretical and not lovers of truth.
The seventh day, in the days of creation, foreshadows the consummation at the end of the age, as it was different than all the other days. Also how man is perfected on the sixth day.
The days of creation show the harmony and peace God always intended us to live in. God created all things to show us a parable of how we are to be in harmony with Jesus Christ. This is the manifestation of God’s government on the earth, when the heavens and earth are subject to Him in peace.