Canada will close all National Parks in a bid to slow the spread of coronavirus, effective March 18.

On Tuesday, Prime Minister Justin Trudeau announced that Canada will close the country-wide system of natural areas and "suspend" visits indefinitely.

Trudeau said "pretty much anything with a door will be closed."

Trudeau says Parks Canada is closing sites on Wednesday. #cdnpoli

— Olivia Stefanovich (@CBCOlivia) March 17, 2020

Although Canada is unlikely to put any physical barriers up around the parks, Trudeau's announcement means that all washroom facilities, cafes and conservation centres will be closed.

Trudeau also revealed during the press conference that the government has not taken the Emergencies Act off the table.

Historically, the Act has only been implemented three times in Canada: during World War I, World War II and by Pierre Trudeau, Justin Trudeau's father, during the October Crisis in Quebec in 1970.

"Canada, let’s work together," Trudeau said. "I know we can do this."