Questions & Answers about Mıknatıs asma kilidin arkasındaydı.
arkasında is built from several parts:
- arka = back, rear
- -sı = its (3rd person singular possessive)
- -nda = in/on/at
So:
- arkası = its back / the back of it
- arkasında = at its back, which naturally means behind it
This is a very common Turkish pattern for location words:
- önünde = in front of it
- yanında = beside it
- içinde = inside it
- üstünde = on it
- arkasında = behind it
So Turkish often expresses behind X as something more literal like at X’s back.