Hudson Bay, Canada

PAUL J. RICHARDS/AFP via Getty Images
PAUL J. RICHARDS/AFP via Getty Images
Given its location in the north-central part of Canada, Hudson Bay is generally far too cold to swim in without contracting severe hypothermia. However, Brazilian Jiu-Jitsu blogger Stephan Kesting noted that taking a canoe through the bay isn’t any less perilous.
Although he doesn’t regret doing so due to its sheer natural beauty, Kesting described this leg of his trip as “the most potentially dangerous and unforgiving body of water that I have ever paddled.” This was due to the threat of sudden storms, dangerously rapid tides, and the presence of territorial polar bears.