Fan waterfalls

The flow widens noticeably as it descends while staying on the rock.

A fan waterfall is a horsetail that spreads out sideways as it drops, so the base is much wider than the top. They form where water leaves a narrow notch and runs down a broad, sloping face. In the right light they look like lace.

How to recognise one

Look for a narrow lip and a much wider foot.

For the geology behind the shapes, read how waterfalls form.