The sea stands for the unconscious itself — vast, deep and older than you. A calm sea is read as inner peace, a rough one as a restless mind. Swimming in the sea points to how freely you move among your own feelings. Big waves crashing toward you are linked to emotions or events that feel larger than you. Gazing at the sea from the shore is read as longing, or as a wish for a wider life; sailing across it stands for a journey of change. Dream books ask whether the sea in your dream invited you in or kept you at a distance.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.