Fort Harrison was a United States military post that existed along the west coast of Florida during the Second Seminole War, on a site which now lies within the city of Clearwater. It was named after William Henry Harrison, the then newly inaugurated President of the United States.

Clearwater is a city and the county seat of Pinellas County, Florida, United States, west of Tampa and north of St. Petersburg. To the west of Clearwater lies the Gulf of Mexico and to the southeast lies Tampa Bay. As of the 2020 census, the city had a population of 117,292. It is the smallest of the three principal cities in the Tampa–St. Petersburg–Clearwater metropolitan area, most commonly referred to as the Tampa Bay area.