When and where is it at its best? Is it safe? Wink wink
As long as its a bacon greased line you should be OK. I recommend a clicker reel to scare off the Piranhas though, those little guys are tough on the waders.Is a disc drag really necessary when playing hooked crocodiles? And what are some good fly patterns? Will they take a greased fly swing? Oh, the possibilities!
I should probably note that a Congo basin angler needn't worry about piranhas, since they inhabit the Amazon basin in South America, which those who are not geographically impaired will know is not in Africa. On the other hand, there is a native fish species - not Nile perch - that has more in common with crocodiles in terms of nasty teeth and disposition. Shredded waders are the least of your problems should you encounter one. Getting your arm or arms back would be your real concern. I can't recall their name, but have seen a couple photographs, and have to wonder about the courage, or outright insanity of the anglers who pursue them.