If the top stripe of an obstruction or junction buoy were red, it would indicate that it should be taken on the _________________ side when leaving the harbor.

A red top stripe on an obstruction or junction buoy indicates a safe passage on the side opposite to the red. This follows the IALA (International Association of Lighthouse Authorities) buoyage system, where red marks typically signify areas that should be avoided. When navigating away from the harbor, if the top stripe is red, the buoy should be passed on the starboard side, which is the right side as you face outward from the harbor. This means that vessels should keep the red buoy to their right side for safe navigation, ensuring that they are avoiding danger or shallow waters often associated with the red marking. Understanding this convention is crucial for maintaining safety while maneuvering in coastal waters, particularly in busy or challenging navigation areas.