What type of boundary is used to depict Alert Areas and MOAs?

The correct representation for Alert Areas and Military Operations Areas (MOAs) on aeronautical charts is a hatched light brown boundary. This visual designation helps pilots and air traffic controllers easily identify areas where unusual activities may occur, such as military training exercises or other potentially hazardous operations. The hatched pattern distinguishes these areas from others that might not have specific operational alerts, ensuring awareness and safety for all aircraft navigating through or near these zones.

In the context of visual charting practices, the hatched light brown serves as a clear and recognizable marker, aiding in situational awareness for pilots, who may need to adjust their flight paths according to the activities that are occurring in these designated areas.