Please give Victor a pet from me.
This is part of the Katherine Gorge (actually one of a series of 13 gorges) on the Katherine River in the Northern Territory of Australia. We did a boat cruise tour. You can swim in some sections of it where there are rock pools, but it is not encouraged because there are crocodiles.
According to Wikipedia (which explains it better than I could) - "There may be freshwater crocodiles in most parts of the river, as they nest along the banks, but they are harmless to humans. Saltwater crocodiles regularly enter the river during the wet season, when the water levels are very high, and are subsequently removed and returned to the lower levels at the onset of the dry season. Thus, swimming in the wet season is prohibited. Cruises of various lengths go as far as the fifth gorge...Freshwater crocodiles are widely distributed along the river year-round. During the wet season, rises in water levels may allow saltwater crocodiles to enter the gorge, where they are caught and relocated to lower levels when the dry season begins."
The Northern territory does not have the traditional seasons of spring, autumn, summer and winter. It has two seasons - the wet and the dry. The wet season is November to April. We were there in August, during the dry season.