What are red buoys under the us Aids to navigation system?

Under the U.S. Aids to Navigation System, red buoys indicate the right side of a channel when entering from the open sea, following the "red right returning" rule. These buoys are typically cylindrical and may be numbered with even numbers. They serve to guide mariners safely through navigable waters and are part of a comprehensive system to enhance maritime safety. Additionally, red buoys may also display a flashing red light at night for increased visibility.