What geographical features are important for the growth of a civilisation?I know it needs to be near a water source and have fertile land, but I...

I would first add to or clarify the idea that
civilizations need a water supply.  Civilizations do need water, but that can come
either from rivers that can be used for irrigation or from relatively predictable
rains.  Water is also important because it enables trade.  In ancient times, it was very
hard to move anything of any great size over land.  Therefore, if you wanted to trade,
you needed to next to the ocean and/or to a relatively large river.  This means that
there are a couple of different aspects to the idea that you need to be near
water.

A second thing, according to Jared Diamond's book
Guns, Germs, and Steel is that a civilization needs to be in a
place where there are plants and animals that can be domesticated.  There are plenty of
places in the world with fertile land and water sources but few plants or animals that
can be domesticated.  The Mississippi River comes to mind as one such example.  Diamond
argues that civilizations sprang up in places where there were naturally-occurring
plants and animals that could be domesticated and used to create agriculture.  This
agriculture led to civilization.  This is a major reason why, to Diamond, civilization
arose in places like the Fertile Crescent rather than in the Americas or
Africa.

So, I would add that civilizations need the raw
materials (plants and animals) that allow agriculture to arise.