[Chazar]

Hmm, I guess it is not that I am entirely lacking imagination, but I thought that I was just missing something because of not being a native speaker...

So "end" is merely like in "Land's end" and "inkpot" can stand for anything dark, inklike. Ok.

Hmm, a pool with a dark liquid resembling ink, that never occured to me, although I think that I have seen such places...