How much of Inner Bostons land area did not exist when the city was founded? [SEP] More than two-thirds of inner Boston's modern land area did not exist when the city was founded, but was created via the gradual filling in of the surrounding tidal areas over the centuries, notably with earth from the leveling or lowering of Boston's three original hills (the "Trimountain", after which Tremont Street is named), and with gravel brought by train from Needham to fill the Back Bay.
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