Sacred Falls State Park is a state park located on the Hawaiian island of Oahu. State park is a term used in the United States and in Mexico for an area of land preserved on account of its natural beauty, historic interest, or other reason, and under the administration of the government of a U.S. state or one of the states of Mexico. ... Official language(s) Hawaiian and English Capital Honolulu Largest city Honolulu Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 43rd 28,337 km² n/a km 2,450 km 41. ... Oahu (usually Oahu outside Hawaiian and Hawaiian English), the Gathering Place, is the third largest of the Hawaiian Islands and most populous island in the State of Hawaii. ...