A word for a “flat space, platform” in notes on Words, Phrases and Passages from the Lord of the Rings, cognate to S. talan and derived from ✶talam (PE17/52). In The Etymologies of the 1930s, ᴹQ. talan was glossed “floor, ground” under the root ᴹ√TALAM “floor, base, ground” (Ety/TALAM).
Neo-Quenya: For purposes of Neo-Quenya, I would use talan as a general word for a constructed “floor” or “platform” both with and without walls and possibly above ground level as well, but for natural “ground” I would use [ᴹQ.] hún (QL/39).
talan (talam-, e.g. pl. talami) noun "floor, base, ground" (TALAM)