American Dream Miami, a retail theme park that would be the largest mall in America, won final zoning approval from the Miami-Dade County Commission.

The $4-billion project, proposed by Canadian developer Triple Five, will include an indoor ski slope and a submarine lake, the Miami Herald reported.

The mega-mall, with six million square feet of retail and entertainment space, predicts 30 million visitors a year and about 70,000 vehicle trips in and out of the property.

“This is the biggest project we’ve ever had in Miami-Dade County,” Mayor Carlos Gimenez was quoted as saying.

Triple Five still needs a string of permits from the county before it can begin construction. The developer hasn’t disclose any construction timeline.