Never mind crocs, watch out for hippos!
There’s a Crocodile River in Gauteng, so the river near Nelspruit that flows east into Mocambique and forms the southern boundary of the Kruger National Park has to be called the “Lowveld Croc”.
A wonderful canoe (kayak really) race is held annually on this river. The presence of hippopotamuses in the river adds a risk and a thrill to the two-day race. Race organisers engage with local farmers and wildlife people and trip the river in the weeks before the race in order to identify possible hippo hotspots which are then compulsory portages on race days. Sometimes a helicopter is used to do a scouting flight on race day morning, and volunteer paddlers also scout the route by starting ahead of the competing racers.
The year I did the race (1983 or 1984) I remember the route as from above Montrose falls to Mbombela town (formerly Nelspruit). We portaged around the falls.
The hippo were in the last pool before the finish in Nelspruit, so the race was ended a few km short at the last accessible spot before the hippo pool. I see they now start higher up and end the race above Montrose falls.