Less than half the 2021 Formula 1 season has been completed, but where the remaining 12 rounds will be raced is as much a mystery as who will win the title in December.
Formula One's plans for calendar expansion are a delicate balancing act of interests.
An unprecedented three back-to-back races will stretch F1 teams at the busiest time of the year.
More races in the United States sounds great, but how will the teams handle as many as 23 races a year?
The Malaysian Grand Prix has announced this year's race will be its last after 19 years in Formula One.
Three grands prix are in doubt for the 21-race 2017 season, with Canada, Germany, and Brazil all under a cloud.
The Australian Grand Prix will continue to host the opening round of the Formula One championship despite a late start to the 2016 season.