Clean water, comrade, not just water, clean water. That means springs and maybe fast-flowing streams well up in the water table, not rivers. Even rivers we think of as clean have all sorts of creatures that find your gut a wonderful place to play.
Hunter-gatherer societies are absolutely the worst-case scenario in economic terms. Moving around with the seasons doesn't mean you'll find anything to eat. Just because there's game, doesn't mean it's yours for the taking in nice, regular amounts. Hunters with high-powered rifles and telescopic sights fail to fill their deer tags season after season. Now imagine you have to do it every week. The natives of the American Pacific Northwest who were famously well-to-do hunter-gatherers suffered terribly when salmon runs periodically failed. The Inuit of Alaska had salmon runs, caribou migrations, sea mammals that feed on one of the richest oceans on the planet, abundant clean water and a natural refrigerator 9 months out of the year. Ask them how much fun hunter-gatherer life was.
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