A collapse and hollowing out have appeared in the basalt above Chihsi Rock Waterfall, a popular photo spot in Penghu — bad news for visitors heading there to take pictures.

• Days of torrential rain have scoured the site, loosening the columnar basalt above the rock waterfall, causing it to subside and leaving a cavity.
• After experts conducted an on-site inspection at the request of the Penghu National Scenic Area Administration, they concluded that the trail is far enough from the cliff face that walking on it poses no danger.
• The real risk is visitors leaving the trail and walking to the abalone ponds below the cliff face to take photos, where they could be injured by falling rocks.
• The Penghu National Scenic Area Administration will step up the posting of notices to discourage visitors from approaching the cliff face.

Outlook: The site will remain open, but controls and warnings against taking photos below the cliff face will be tightened, and the stability of the rock mass may be reassessed after the rainy season.