The Ninepin Group falls under the jurisdiction of Sai Kung District of Hong Kong.
The islands of the group include: The Ninepin Group features hexagonal vertical rhyolite columns, the volcanic rock resulting from a volcanic eruption near Sai Kung about 140 million years ago.
Ninepin Group is extremely eroded due to the heavy tides that wash against the islands every day.
For a long time, the Ninepin Group was devoid of human presence.
The Ninepin Group Special Area (果洲群島特別地區) covers 53.1 hectares and was designated in 2011.