Field by the shore of Nen Hithoel glossed “Green Sward” (LotR/417, RC/349), a combination of parth “sward” and the lenited form of calen “green”.
Conceptual Development: In Lord of the Rings drafts from the 1940s, Tolkien considered several names for this field, first N. Kelufain and Forfain revised to Calenbel >> N. Calembel (TI/371, TI/382). The name Calembel went through a number of revision starting with Cale(m)- before Tolkien settled on Parth Galen (WR/301, 307). Later, the name S. Calembel was reused for a town in Gondor (LotR/790).
parth (“field or enclosed grassland”), calen (“green”)