Already home to one of the globe's biggest indoor shopping complexes, Dubai Mall, the glitzy emirate known for its love of grandiose projects said it is now planning to build the "Mall of the World".

The all-pedestrian complex would occupy a total area of 48 million square feet (4.45 million square metres), said Dubai Holding, the developer owned by Dubai ruler Sheikh Mohammed bin Rashid al-Maktoum.

The project "will comprise the largest indoor theme park in the world" under a glass dome that would be opened during winter, it said in a statement.

The seven-kilometre (4.35 mile)-long promenades connecting the facilities would also be covered and air-conditioned during summer, it added.

"Our ambitions are higher than having seasonal tourism.