Beijing is planning to create a new Silicon Valley equivalent in southern China.
A "Greater Bay Area" designed to rival California's tech centre would cover 21,815 square miles and have a population of more than 67 million people.
The region would include Hong Kong and Macau, as well as part of mainland China.
Officials approved a plan at the weekend and details are due to be unveiled in February, according to local reports.
The plan means mainland China could capitalise on the international reputation of Hong Kong and Macau for tourism, finance and trade.