The Atlantic Neptune, nautical charts of the Atlantic coast by Joseph F. W. Des Barres, was published in about 1776. It is divided into four series: Nova Scotia, New England, the River and Gulf of St. Lawrence, and New York Southward.

This map was created by Maine Historical Society using the two sheets of the Chart of Casco Bay from the New England series. These were reduced in size and pieced together with modern color added to create this single-sheet map.