These maps show the location of red tides reported in Hong Kong from November 2008 to November 2009.
During this one-year period, two peaks were noted. The first peak started in February 2009, involving 11 locations, the number falling to 5 in the following month. In both months, red tides were spotted in Clear Water Bay First and Second Beach. The second peak then occurred in November 2009, with a total of 12 locations. In the remaining months, only isolated red tides were recorded. Deep Water Bay was the commonest location of red tide during the year.