Fenced about is a term used to describe the act of surrounding or enclosing something with a fence. There are a plethora of synonyms that can be used in place of this expression including encircled, surrounded, bordered, hedged, corralled, walled, and barricaded. Each of these words denotes a different type of enclosure or restriction, and their usage depends on the context in which they are used. For instance, if the context is related to military or defence operations, the word barricaded may be preferred over others. Similarly, if the context is about a garden or park, the word hedged would be preferred. Overall, it is vital to choose the correct synonym based on the intended meaning and context of the sentence.