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Given that central Florida is primarily a wetlands region, construction crews faced a variety of challenges with relocating water while not affecting the local environment. Construction crews built more than 50 miles of levees and canals around the property to maintain levels and quality of the local fresh water while draining areas where construction would take place. This control system, which functions automatically based on water levels and without electricity, helps to minimize flooding without removing water from the area. Even bodies of water that would remain on the site needed to be cleaned and made safer for recreational use. Bay Lake was drained of its water and cleaned of muck. Construction workers removed more than seven million cubic yards of dirt from an adjacent area to create a man-made lagoon, named Seven Seas Lagoon. Sand from beneath the removed muck was used to create beaches around the lagoon. Once Bay Lake and the Seven Seas Lagoon had been filled with water, the surrounding areas served as the setting for one of the hotels, the Polynesian Village Resort.