THE seacoast of Maine is indented with numerous bays. Of these the largest is _Penobscot Bay_, which forms the estuary of the river of that name, is about thirty miles in length, and eighteen in width at its entrance between the isle of Holt and Owl’s Head. It incloses Fox, Haut, Long, and Deer islands, besides a number of small islands and rocks. On a fine peninsula in this bay the British, in the late war, built a fort, and made a settlement, which is now the shire town of the county of Hancock, and is a very commodious place for the lumber trade. _Broad Bay_ is situated about twelve miles westwardly, and is bounded by Pleasant-point on the east, and Pemaquid-point on the west, the latter of which projects considerably into the sea. _Casco Bay_ lies between Cape Elizabeth and Cape Smallpoint, and averages twenty-five miles in width by fourteen in length; it forms the entrance into Sagadahok river, and has sufficient depth of water for vessels of any burden. This is a very handsome bay, and contains not less than three hundred small islands, some of which are inhabited, and nearly all more or less cultivated; the land on these islands, and on the opposite coast, being the best for agriculture of any near the seashore of this part of the country. _Wells Bay_ lies between Cape Porpoise and Neddick, which are twenty-one miles apart. _Passamaquoddy Bay_, forming a part of the boundary between Maine and New Brunswick, is six miles long and twelve wide; it contains many islands, and receives the St. Croix river. Small harbors are numerous, and the shores are rocky and bold. Besides the bays here described, are the _Saco_ and _Machias_ bays. _Massachusetts Bay_ is about forty miles in extent, lying between Cape Ann on the north and Cape Cod on the south. Within this lies _Boston Bay_, comprising the space between Nahant on the north and Point Alderton on the south, and including the harbors of Boston, Lynn, Dorchester, Quincy, and Hingham, with Nantucket and President Roads, and the numerous islands within the Boston lighthouse. The most noted of these are Governor’s Island, and Castle Island, on both of which fortifications are erected; they lie about two and a half miles easterly from Boston, at the distance of about a mile from each other, dividing the inner from the outer harbor. The only channel for large ships passes between them. This harbor is of sufficient extent, and its water is sufficiently deep to admit five hundred ships of the largest class to ride at anchor in safety; while its entrance is so narrow as scarcely to admit two ships abreast.