atmel studio 7 - .noinit section

[cinterion]

Hello,
I'm new tu ATMEL STUDIO 7. I'm working on a project based on a SAM4E8C ( a custom board ).
I don't understand why when I declare a variable ".noinit" the variable is placed by default at address 0x00438e40 that is in flash mamory.
I know that I can define the ".noinit" section but I don't understand why the default address is in flash memory.
thanks for your help.