Mount Vernon is an American landmark and former plantation of George Washington, the first President of the United States, and his wife, Martha. The estate is on the banks of the Potomac River in Fairfax County, Virginia. It is located south of Washington, D.C. and Alexandria, Virginia and is across the river from Prince George's County, Maryland. The Washington family acquired land in the area in 1674. Around 1734, the family embarked on an expansion of its estate that continued under George Washington, who began leasing the estate in 1754 before becoming its sole owner in 1761.