Lateral markers are buoys or beacons that indicate the edge of a channel, fairway, anchorage, or other area where boats are permitted to navigate. They may also be used to mark hazards such as shoals. Lateral markers are typically colored red and green, with red indicating the port (left) side of the channel and green indicating the starboard (right) side. Some lateral markers may have additional markings such as arrows or lights to further aid in navigation.