The two meanings of the word surveyed in the pun by Thoreau you have thus surveyed he country on every side within a dozen miles of where you live are to mark boundaries and to look over visually.
◘ To mark boundaries and to look over visually. surveyed
Thoreau is using the literary device of puns in this sentence.
To mark boundaries and to look over visually-apex
Thoreau uses the literary device of wordplay with the term "surveyed," which means both physically examining and assessing the land, reflecting his deep observation and reflection of nature. This choice emphasizes his thorough exploration and understanding of the area near his home.
Pun. surveyed
Surveyed -Apex
It prevents that person from exploring within.
Technical terms.
Inwardly; within the enveloping surface, or the boundary of a thing; within the body; beneath the surface. Or On or from the inside.
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the symbolic meanings within a media text.
Thoreau does not feel confined in prison because he views his time there as an opportunity for inner reflection and resistance against unjust laws. By maintaining his principles and beliefs, he finds a sense of freedom even within the physical confines of the prison.