150-200 years ago drowning whilst crossing rivers was known colloquially as "The New Zealand death". For a very good reason.
And yip, I too remember being taught how to cross rivers waaay back in Intermediate school, age 12. Then many times again at various bushcraft camps when deep into Tramping clubs. We always started teaching in gentle wide rivers in mid summer. Otaki River from memory. But winter temps and dirty fast water with no safe run out, even getting to knee height can be dodgy
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