What climate or biome did most early civilizations successfully settle in?

Im doing a geography project where I get a continent and have to figure out where to start an early civilization while working with three others doing

I'm doing a geography project where I get a continent and have to figure out where to start an early civilization while working with three others doing the exact same thing on the continent. I have no idea where to put my civilization and am having trouble researching it. This fake continent is between 0 degrees and 60 degrees north with high mountains to its west and rivers spanning the whole area.

or:I'm doing a geography project where I get a continent and have to figure out where to start an early civilization while working with three others doing the exact same thing on the continent. I have no idea where to put my civilization and am having trouble researching it. This fake continent is between 0 degrees and 60 degrees north with high mountains to its west and rivers spanning the whole area.

or:Obviously they first settle the place where they arrived. Usually that means a seaport with a town just just a few steps inland. It has to have water -- nobody wants to settle in a desert. It has to have farm soil, and there you find a very interesting fact. Go find pictures of anyplace that had a volcano eruption recently and marvel at the lush greenery. Go to maps.google.com and look at Blanding, Utah -- no water, no trees, poor soil, no way to earn a living except by catering to tourists headed for Four Corners. The town has no evidence of any natural disaster ever. It takes violence to make a place nice to live in.

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