Black Water 2007

Adam, his wife, Grace, and her sister Lee, go on a fishing trip to the mangrove swamps of Northern Australia. When their tour guide has a mishap, they are left to fend for themselves.
Crocs shot in Darwin NT and the mangrove scenes shot in Sydney NSW.
Based on a true story, with some serious alterations. A young man was swept away by a fast flowing river and his friends went in to save him, they managed to climb into a tree and were stalked by a large croc, the same croc that had recently dined on one of them.
Anyway, not a bad film.