Found about ninety times in the New Testament, the Greek noun “thalasso” meant “lake,” “sea,” “the sea.”  While this word can describe inland lakes as well as “open seas,” it is also used symbolically.  In fact, the book of Revelation uses this word more than twenty times (compare Rev. 4:6; 5:13; 7:1-3; 21:1).  Silva 2:402) noted how “God is the Creator of the tripartite world consisting of heaven, earth, and sea (Acts 4:24; 14:15; Rev. 10:6; 14:7).  This is also one of the places where God has shown His power (Mt. 8:23-27; 14:22-33).

“In the sea the power of water hostile to God and men opposes the people of Israel (Jer. 51:42; Pss. 46[45]:3f.; 65(64):8).  (Dictionary of New Testament Theology, 3:983).  The sea is also described as the habitation of the dragon who is a great enemy of God (Rev. 13:1), and the four great beasts from the sea (Dan. 7:1-2).