Almost 700 teenage schoolies are among thousands of Australians bracing for monster Cyclone Evan's arrival in Fiji.

Fijian authorities are scrambling to evacuate people from low-lying areas amid warnings the category 4 tropical cyclone could wreak catastrophic damage.

Australian Foreign Minister Bob Carr says there are 680 schoolies registered with the government as currently being in Fiji, with many more believed to be unregistered.

The groups are travelling as part of organised tours, a spokesman for Senator Carr said on Sunday.


"Those 680 have all been accounted for, none of them are wandering about by themselves," the spokesman told AAP.

Some of those schoolies managed to get out of the country on Sunday but many more could not get flights, reports suggest. Tour groups have been ferrying many of them from outlying islands to the main island of Viti Levu.