South China, defined here as the area of Guangdong Province within a 100-kilometer radius of Hong Kong, is also known as the Pearl River Delta (PRD), including the largest exhibition centres in Dongguan, Guangzhou, Shenzhen and Shunde as well as Hong Kong and Macau. Last year, 242 major B2B trade fairs were held in the region, an increase up from the 228 of 2009 and close to the high of 250 trade fairs held in 2007. The 2010 figure is still considerably higher than the 196 trade fairs held in 2006. The figure in 2005 was just 166.