Canadian capital city.
See also: http://id.loc.gov/authorities/names/n79063073
The graph displays the other subjects mentioned on the same pages as the subject "Ottawa (Ont.)". If the same subject occurs on a page with "Ottawa (Ont.)" more than once, it appears closer to "Ottawa (Ont.)" on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.