Spanish River Park takes its name from the shallow freshwater stream, which once flowed along what is now the western edge of the park. Spanish River Park is 94.4 acres in size. Since its channelization by the U.S. Army Corps of Engineers, the river has become known to boaters as part of the intracoastal waterway. Early maps show the river as “Boca Raton’s Lagoon”, but late settlers and developers apparently borrowed a page from history and renamed it the old Spanish river, Remnants of the meandering stream bed are still visible in the park.