Ottawa is situated on the south bank of the Ottawa River, and contains the mouths of the Rideau River and Rideau Canal. The older part of the city (including what remains of Bytown) is known as Lower Town, and occupies an area between the canal and the rivers. Across the canal to the west lies Centertown and Downtown Ottawa, which is the city's financial and commercial hub. As of June 29, 2007, the Rideau Canal, which stretches 202 km (126 mi) to Kingston, Fort Henry and four Martello towers in the Kingston area was recognized as a UNESCO World Heritage Site.
Located on a major, yet mostly dormant fault line, Ottawa is occasionally struck by earthquakes. Examples include a magnitude 5.2 earthquake on January 1, 2000, a magnitude 4.5 earthquake on February 24, 2006, a magnitude 5.0 earthquake on June 23, 2010
