A map released by the state government on Wednesday morning makes dire predictions about the effect of climate change on some of Perth's waterside suburbs, forecasting Elizabeth Quay, Heirisson Island and South Perth's Mill Point would be under water from rising sea levels and flooding by early next century.

Released as part of the Draft Perth Water Precinct Plan, the map also shows parts of Langley Park and East Perth would be sunk.

Flood waters could also reach past Supreme Court Gardens and into estates controlled by Government House.

A map released by the WA's Department of Biodiversity, Conservation and Attractions shows the toll of climate change on riverside suburbs around Perth Waters. Credit:WA Government

"The precinct is susceptible to flooding and sea level rise, and with the risk of increased inundation over the longer term, the impact of climate change and other environmental conditions needs to be considered," the document said.