Strong’s Greek
G3989 — pelagos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
πέλαγος
pelagos — pronounced pel'-ag-os
of uncertain affinity; deep or open sea, i.e. the main:--depth, sea.
2 occurrences in the KJV.
Matthew 18:6
But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.
Acts 27:5
And when we had sailed over the sea of Cilicia and Pamphylia, we came to Myra, a city of Lycia.