Why are the buoys in the sea red and green?

Buoys in the sea are colored red and green to indicate navigational channels and guide vessels safely through waterways. Typically, green buoys mark the right side of a channel when entering from the sea (known as "starboard"), while red buoys mark the left side ("port"). This color-coding system helps mariners maintain proper course and avoid hazards. Additionally, the colors conform to the IALA (International Association of Lighthouse Authorities) buoyage system for maritime navigation.