The border between Victoria and New South Wales will be shut on Tuesday night as COVID-19 continues to wreak havoc in Melbourne.
A new daily Victorian record has been set for new coronavirus confirmations, with 127 cases confirmed on Monday morning.
There are now 645 active COVID-19 cases in Victoria.
There has not yet been any further details on coronavirus locations today.
The dramatic decision to close the border was made at an early morning hook-up between Premier Daniel Andrews, NSW Premier Gladys Berejiklian and Prime Minister Scott Morrison on Monday.
Mr Andrews is expected to announce the border closure at a press conference at 10.45am on Monday.
The border is expected to close at midnight on Tuesday.
It will be the last state border to close in Australia, following the remaining states that have remained closed for weeks.
Twelve Victorian postcodes and nine public housing towers have been put into lockdown in order to prevent the spread of the virus in the state, which now has 2536 confirmed cases.
More than 500 remain active.
The border between the two states has remained open throughout the health crisis, as towns share infrastructure, including the Albury-Wodonga Health public hospital.
"I'm not interested in closing our borders I don't think that makes a lot of sense for us," Mr Andrews said in March.