Want to hunt the skittish gray ghost of the flats, the bonefish? Come to the Keys. Feel like battling a reel-emptying blue marlin? Come to the Keys. Want to sit in a beach chair, sipping a cold cocktail while watching your bobber dance in the current? Come to the Keys. The tropical weather, nearby Gulf Stream and 120-mile-long arc of islands that make up the Florida Keys create one of the world’s best fishing environments. Off the Keys’ “outer” curve lies the Atlantic Ocean. Warm and shallow near shore, the ocean reaches depths of more than 600 feet just 11 miles offshore in the Upper Keys. Near Key West, 600-foot depths are just over five miles from shore. Travel another 12 to 15 miles south, and depths begin to approach 2,000 feet. Keys deep-sea fishing — ideally with a first-class local charter captain — means targeting some of the world’s greatest sportfish: sailfish, swordfish and marlin.