Here's Emily Dickinson on the matter:
As if the Sea should partNever published in her own life, Dickinson here makes me think of all those who went through those waters, but died in the desert, never having made it into the Promised Land: "themselves the Verge of Seas to be."
And show a further Sea--
And that--a further--and the Three
But a presumption be--
Of periods of Seas--
Unvisited of Shores--
Themselves the Verge of Seas to be--