Like much of the
Massachusetts landscape, the peninsula was shaped by
glacial erosion and
moraine deposits left by retreating glaciers at the end of the last
ice age. When Europeans arrived, Shawmut was thickly forested. The pre-settlement topography of the peninsula was marked by three hills: Copps Hill, in what is now the
North End; Fort Hill, in today's
Financial District; and the Trimountain, today's
Beacon Hill district. Of the three hills, the Trimountain was by far the largest, a steep-sided mass with three summits. Its name was eventually shortened to Tremont. To the south was a narrow
isthmus named
Boston Neck that connected the peninsula to the mainland site of
Roxbury, now a neighborhood of Boston. ==English settlement==