Hyde Park is 350 acres ( 1.4 kmÂ ) , together with Kensington Gardens ( 275 acres , 1.1 kmÂ ) that is in the immediate neighborhood the parks have an overall area of 625 acres ( 2.5 kmÂ ) . The park is contiguous with Kensington Gardens ; although often still assumed to be part of Hyde Park , Kensington Gardens has been technically separate since 1728 , when Queen Caroline made a division between the two . Hyde Park covers 142 hectares ( 350 acres ) and Kensington Gardens covers 111 hectares ( 275 acres ) , giving an overall area of 253 hectares ( 625 acres ) , making the combined area larger than the Principality of Monaco ( 196 ha\/484 acres ) , though smaller than New York City 's Central Park ( 341 ha\/843 acres ) .