Macau is known for its casinos
The authorities in Zhuhai, southern China, have announced a detailed blueprint of plans to develop Hengqin island.
The island, home to about 4,000 people, is very close to Macau.
The plans call for oil and gas terminals, entertainment centres - and a branch of Macau's univeristy to be accessed by tunnel.
Development planning for the complex cross-border project has been underway over the past decade.
Debate has been controversial due to the differing legal and political systems between China and Macau
Macau is a former Portuguese colony now granted autonomy under Chinese sovereignty.
