When 'islands' are contrasted to 'earth' or 'mountains,' they signify the truths of faith, because they are in the sea. They signify doctrinal things which are rituals. 'Islands' signify peoples who are more remote from the worship of God. People who are steeped in the internal sense of the Word, such as angels, do not know what islands are, because they no longer have any concept of such places. Instead they have a perception of more remote worship, like the gentiles outside the church.

'Islands,' in Ezekiel 27:6, signify people in the church in a natural, materially-oriented state but still rational.

(References: Apocalypse Explained 406; Isaiah 1, Isaiah 49, 49:1)

In Genesis 24:10, 64, this signifies in general worldly knowledge in the natural man. (Arcana Coelestia 3046, 4104)

In Jeremiah 49:32, this signifies memory-knowledges used to confirm truths or falsities. (Apocalypse Explained 417[7])

A camel (Matthew 22:24) signifies scientific knowledge.

(References: Arcana Coelestia 3048, 10227)