What body of water was XXX next to?
Theodore Roosevelt Island
Theodore Roosevelt Island is a 88.5-acre (358,000 m2) island and a national memorial located in the Potomac River in Washington, D.C. The island was given to the American people by the Theodore Roosevelt Association in memory of the 26th U.S. president, Theodore Roosevelt; before that, the island had been known as My Lord's Island, Barbadoes Island, Mason's Island, Analostan Island, and Anacostine Island.
Potomac River