text: Follow the signs to the sightseeing point where , on the predictably clear day , you can see acrose48 km ( 30 miles ) of blue ocean to La Desirade , 67 km ( 42 miles ) to Antigua , and even 77 km ( 48 miles ) to the ash-covered peaks of Montserrat .
  
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  The foothills of Montserrat , however , are blocked by the silhouette of La Desirade .