The campus of Chulalongkorn University in Bangkok occupies an area of 637 rai (101.9 ha; 252 acres) in the city centre's Pathum Wan District. It accounts for just over half of the 1,153 rai (184.5 ha; 456 acres) of land owned by the university, the rest of which is commercially developed or used by other institutions. The campus sits on what was originally royal land surrounding Windsor Palace, granted for the university's use at its foundation in 1917 by King Vajiravudh. Ownership of the land was transferred to the university by an Act of Parliament in 1939.