text: The Blackstone River forms in the center of Worcester by the confluence of the Middle River and Mill Brook. The river courses underground through the center of the city, and emerges at the foot of College Hill. It then flows south through Quinsigamond Village and into Millbury. Worcester is the beginning of the Blackstone Valley that frames the river. The Blackstone Canal was once an important waterway connecting Worcester to Providence and the Eastern Seaboard, but the canal fell into disuse at the end of the 19th century and was mostly covered up. In recent years, local organizations, including the Canal District Business Association, have proposed restoring the canal and creating a Blackstone Valley National Park.
  Worcester is one of many cities claimed, like Rome, to be found on seven hills: Airport Hill, Bancroft Hill, Belmont Hill (Bell Hill), Grafton Hill, Green Hill, Pakachoag Hill and Vernon Hill. However, Worcester has more than seven hills, examples of which include Indian Hill, Newton Hill, Poet's Hill, and Wigwam Hill.
  Worcester has many ponds and two prominent lakes: Indian Lake and Lake Quinsigamond. Lake Quinsigamond (also known as Long Pond) stretches  across the Worcester and Shrewsbury border and is a very popular competitive rowing and boating destination.
  Climate
  Worcester's humid continental climate (Köppen: Dfb) is typical of New England. The weather changes rapidly owing to the confluence of warm, humid air from the southwest; cool, dry air from the north; and the moderating influence of the Atlantic Ocean to the east. Summers are typically hot and humid, while winters are cold, windy, and snowy. Snow typically falls from the second half of November into early April, with occasional falls in October; May snow is much rarer. The USDA classifies the city as straddling hardiness zones 5b and 6a.