Written Expression: Fort Jefferson , in the Dry Tortugas off the southern tip of Florida, can be reach only by boat or plane. off plane only by tip reach

The sentence provided contains a grammatical error. The correct preposition to use in this context is "can be reached only by boat or plane." Here is the corrected sentence:"Fort Jefferson, in the Dry Tortugas off the southern tip of Florida, can be reached only by boat or plane."The error was in the word "reach." It should be in the passive voice form "reached" to correctly convey that the fort can be accessed in this manner.