Police are investigating an incident in outback Queensland where a sacred well believed to be thousands of years old was filled with concrete.

The native well is one of several in the region – roughly 90 kilometres west of Windorah in the state’s west.

The damage was discovered by Mithaka Aboriginal Corporation rangers during a routine check.

Ranger coordinator Trudy Gorringe said they removed about 25 kilograms of concrete, stones and soil from the well.

The matter is being investigated by police and the damage carries a maximum of five years imprisonment.