The Great Barrier Reef was designated a natural world heritage site in 1981 because of its remarkable biodiversity. The reef itself is part of the larger Great Barrier Reef Marine Park. With so many visitors each year, there is some concern that tourism is harmful to the reef. Water sports and boating activities especially need to be monitored to prevent environmental harm. When a boat drops anchor, the anchor itself can destroy soft coral and chip hard coral. It can also disturb the local ecosystem when it drags across the seabed. The coral reefs themselves only make up about seven percent of the entire marine park. The marine park is divided into zones that have different levels of protection. Each zone has different rules about the activities that are permitted and those that are not. Certain zones limit or restrict boat anchorage. This is especially true of zones containing coral. There are also other environmental threats faced by the Great Barrier Reef. What is one thing that tourists can do to help conserve the reef?