At the inward, western extremity of the harbor is the pear-shaped Shawmut peninsula of Boston, having water ways almost all around it. Upon the one side is South Boston and upon the other Charlestown, the comparatively narrow intervening water courses of Fort Point Channel and Charles River being in parts nearly roofed over with bridges, that grudgingly open their draws to let through the vessels laden with lumber and coal. To the northeast, upon another peninsula, which formerly was an island, is East Boston, having Chelsea beyond to the northward. Towards the west, across the broadened estuary of Charles River, is Cambridge, this part of the estuary known as the Back Bay having been largely encroached upon to create more land for the crowded and spreading city. To the southward are Roxbury and Dorchester, and to the westward Brookline, Brighton and Somerville. Upon the Shawmut peninsula, the original city of Boston covered only seven hundred and eighty-three acres, but by the reclamations this has been more than doubled. It absorbed Dorchester Neck to enlarge South Boston; took in Noddle's Island for East Boston; and annexed about all the other suburbs, so that the city now covers forty-three square miles. The hills have been partly levelled and the whole face of the ancient town altered, these improvements and the great changes wrought by fires obliterating the older narrow and crooked streets, having thus wrought a complete transformation. The alignments of the colonial maps can now hardly be recognized, and scarcely a vestige, beyond the three old burying-grounds and a few buildings, remains of primitive Boston. When the first settlers coming from Charlestown saw Shawmut or the Tri-mountain, it seemed to chiefly consist of the three high hills which they called Copp's, Beacon and Fort Hills, the highest of these, the Beacon, being itself a sort of tri-mountain, having three well-developed surmounting little peaks. These, however, were afterwards cut down, although the massive elevation of Beacon Hill, whereon the colonists burnt their signal-fires, remains the crowning glory of the peninsula. BOSTON COMMON.