Building a landscape

Development World Creation
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1

im new to this so this is a basic question, i think.
i want to make an area with a lake. i want the lake to be around 2.5 miles by 1 mile (using a real lake as a reference)

my understanding is that 1uu=1cm and 2.5 miles is about 400k cm

inputing this size to a floor object and i end up with a circle of visible space and the object extending far beyond that.

i dont understand what im doing wrong and i havnt seen any tutorials that touch on the matter.

2

To make one, make the landscape, then make sure you are using the sculp tool, then make a hole, lastly go to the flatten tool, go to where you made the hole, press on it, and start making it