Prohibited areas contain airspace of defined dimensions  within which the flight of aircraft is prohibited. Such areas  are established for security or other reasons associated with  the national welfare. These areas are published in the Federal  Register and are depicted on aeronautical charts. The area  is charted as a “P” followed by a number (e.g., “P-49”).  [Figure 5-9] Examples of prohibited areas include Camp  David and the National Mall in Washington, D.C., where the  White House and Congressional buildings are located.  Restricted areas are areas where operations are hazardous to  nonparticipating aircraft and contain airspace within which  the flight of aircraft, while not wholly prohibited, is subject  to restrictions. Activities within these areas must be confined  because of their nature, or limitations may be imposed upon  aircraft operations that are not a part of those activities, or  both. Restricted areas denote the existence of unusual, often  invisible, hazards to aircraft (e.g., artillery firing, aerial  gunnery, or guided missiles). Penetration of restricted areas  without authorization from the using or controlling agency  may be extremely hazardous to the aircraft and its occupants.  ATC facilities apply the following procedures:  Warning areas consist of airspace which may contain hazards  to nonparticipating aircraft in international airspace. The  activities may be much the same as those for a restricted  area. Warning areas are established beyond the three mile  limit and are depicted on aeronautical charts. Warning Areas  are also defined on the backside of the appropriate sectional  chart.  [Figure 5-11] 1.  If the restricted area is not active and has been released  to the Federal Aviation Administration (FAA), the  ATC facility will allow the aircraft to operate in the  restricted airspace without issuing specific clearance  for it to do so. 2. If the restricted area is active and has not been released  to the FAA, the ATC facility will issue a clearance  which will ensure the aircraft avoids the restricted  airspace. Restricted areas are charted with an “R” followed by a number  (e.g., “R-4401”) and are depicted on the sectional charts.  [Figure 5-10]  Restricted area information can be obtained  on the back of the chart.  [Figure 5-11] 5-6 $_{Figure 5-11.}$  Specific information about a restricted area can be  found on the back of the sectional chart. Warning Areas Restricted Areas Prohibited Areas Figure 5-10.  Restricted areas on a sectional chart. Figure 5-9.  An example of a prohibited area is Crawford, Texas.