An emergency warning is in place as two out-of-control fires burn in the Royal National Park, south of Sydney, sending thick plumes of smoke across the city. Multiple crews and a waterbomber are battling the fires near Bundeena, with one burning along Sir Bertram Stevens Drive and the other south of Wattamolla Road. The Royal National Park has been closed at McKell Avenue and Farnell Avenue, with visitors being advised to avoid the popular tourist area. The NSW Rural Fire Service (RFS) has advised those who are at Little Garie, Garie, North Era, South Era or Burning Palms to remain where they are. Visitors who are elsewhere in the park are being urged to leave only if the path is clear or if they are directed by emergency services. Visitors have been urged to head to the beaches, which "may offer safety". Bundeena is a small coastal town 29 kilometres south of the Sydney CBD. Further south, near Bowral, rural properties in the area of Alders and Crees Road in Bannaby may soon come under threat by a blaze that is burning through grass in the area, the RFS has said. The 90-hectare fire is at a watch-and-act level as firefighters and an aircraft work to slow the spread of the fire. East of Canberra, firefighters from the ACT have been sent into NSW to protect houses threatened by another bushfire in the NSW Southern Tablelands. Three heavy tankers, backed up by smaller crews, were deployed to the 274-hectare Braidwood blaze this morning after it burned through the night. "Their objectives are to protect properties, attack and contain the main fire and contain spot fires," the ACT Emergency Services Agency said. Meanwhile, firefighters continue to battle a bushfire that has burnt about 20,000 hectares in the Pilliga Forest between Coonabarabran and Narrabri. The fire is at an advice level with no homes are under threat, but residents are being urged to monitor conditions. Firefighters are currently conducting back-burning operations in the area and the Newell Highway has been shut between Narrabri and Coonabarabran, likely to remain closed today.