There has been granted to the United States a strip of marshland not exceeding seven hundred feet in width, lying and being in Beaufort County between the tidal streams known as Ramshorn Creek and Cooper River, and being more particularly described as follows: Beginning at a point "A" near the north bank of Ramshorn Creek, said point being a permanent triangulation station the location of which is recorded in the United States engineer office, Savannah, Ga.; thence 800 feet N. 47? 00′ E. (true) to a point "B" near the south bank of Cooper River, said point being a permanent triangulation station; thence N. 47? 00′ E. (true) to a point "C," said point being at the low-water line in Cooper River; thence following the low-water line in Cooper River to a point "D"; thence approximately 2300 feet S. 47? 00′ W. (true) to a point "E," said point being a permanent triangulation station (the line from point "D" to point "E" being parallel 700 feet from the line between point "A" and point "B"); thence approximately 385 feet west at a point "F," said point being at the low-water line in Ramshorn Creek; thence following the low-water line in Ramshorn Creek to a point "G"; thence N. 47? 00′ E. to the point of beginning. Said grant was made in order to facilitate the improvement of inland navigation and the United States may dredge, cut, fill in, occupy and use said strip of marshland in any way that may be necessary to execute any project for said improvement which the Department of Defense or Congress, may adopt and for no other purpose.