The United States and United Kingdom have the most powerful combined naval force on the planet. Does this mean we can control the seas where and when we want? Maybe not.
Naval history is replete with tales of victory by great fleets on the high seas. But it is also punctuated by the stunning defeats of many of these same fleets in their adversaries' coastal waters, or littorals. Although it may seem self-evident that a coastal navy would not fare as well in blue-water warfare, the limitations of a blue-water navy in the littorals are less obvious and often unanticipated.