<P> The South Lawn at the White House in Washington, DC, is located directly south of the house, and is bordered on the east by East Executive Drive and the Treasury Building, and on the west by West Executive Drive and the Old Executive Office Building, and along its curved southern perimeter by South Executive Drive and a large circular public lawn called The Ellipse . Since the address of the White House is 1600 Pennsylvania Avenue NW, and the North Lawn faces Pennsylvania Avenue, the South Lawn is sometimes described as the back lawn of the White House . </P> <P> The South Lawn presents a long north - south vista from the house . Open to the public until the Second World War, it is now a closed part of the White House grounds that provides a setting for official events like the State Arrival Ceremony as well as informal gatherings including the annual White House Egg Rolling Contest and staff barbecues . Marine One, the presidential helicopter, departs from and lands on the South Lawn . </P> <P> When the White House was first occupied in 1800 the site of the South Lawn was an open meadow gradually descending to a large marsh, the Tiber Creek, and Potomac River beyond . Thomas Jefferson completed grading of the South Lawn, building up mounds on either side of a central lawn . Jefferson, working with architect Benjamin Henry Latrobe located a triumphal arch as a main entry point to the grounds, just southeast of the White House . Pierre - Charles L'Enfant's 1793 plan of the city of Washington, indicates a setting of terraced formal gardens descending to Tiber Creek . Later in 1850, landscape designer Andrew Jackson Davis attempted to soften the geometry of the L'Enfant plan, incorporating a semicircular southern boundary and meandering paths . Andrew Jackson Davis's changes included enlarging the South Lawn, creating a large circular lawn he termed the "Parade or President's Park" and bordered by densely planted shrubs and trees . During the administration of Ulysses S. Grant the marsh to the south was drained, and the South Lawn received additional grading and 8 to 10 feet of fill to make the descent to the Potomac more gradual . </P>

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