Charade No. 35

Apologies for not posting in quite a while. Here is a charade originally published in a magazine where the winner sent his or her answer in rhyme. Once one of you has guessed the answer, I will post the rhyming version.

Take the name of a thing that your body contains,
Then scan all your thoughts, and puzzle your brains,
Add to it a thing, which in vallies (sic) is plenty,
But go to the hills and you’ll find it right scanty;
And those two together, when you have made known,
To the world you’ll discover a rich trading town.

Enjoy!