GIANT rocks have fallen at least 700 metres from the top of a hill, causing a spectacular sight on the property of a local farmer.

The rocks fell from the southern end of the Garden Range at Gooram Valley early last week, leaving a devastating trail that included damage to trees, fences and local water supplies on Robert Colvin's farm.

The rocks have left a clear path from the top of the hill down to the paddock where they eventually stopped, with craters forming at every point they bounced on the way.

The largest rock, measuring over two metres high and two metres wide, is estimated to weigh over 20 tonnes.

A slightly smaller rock was located nearby and is estimated to weigh close to 6 tonnes.

No one saw the rocks fall, with the impact being spotted last Monday by Mr Colvin and his family.

Since then, the family has trekked to the top of the hill to see if they could spot the point it fell from.

Questions remain over how the rocks fell from the top of the hill, with them speculating recent rains or possible tremors nearby being suggested as the cause.