Beneath the plain lies the Biscayne Aquifer, a natural underground source of fresh water that extends from southern Palm Beach County to Florida Bay, with its highest point peaking around the cities of Miami Springs and Hialeah.
Under sletten ligger Biscayne Aquifer, en naturlig underjordisk kilde til frisk vand, der strækker sig fra det sydlige Palm Beach County til Florida Bay, med sit højeste punkt topper omkring byerne Miami Springs og Hialeah.