From nuwph in the sense of lifting; a height; also a sieve -- border, coast, region, sieve.
see HEBREW nuwph
H5299. naphah
I. [נָפָה] noun feminine sieve or other winnowing implement, Di Du Schwinge, CheHpt fan (as swung); — only construct שָׁוְא בְּנָ֫פַת גוֺיִם לַהֲנָפָה Isaiah 30:28 to swing nations in a sieve of worthlessness.
II. [נָפָה] noun feminine height; — only construct in combination דּוֺר נָפַת Joshua 12:23 = ׳נ דּאֹר 1 Kings 4:11, plural construct ד ׳נָפוֺת Joshua 11:2; compare II.דּוֺד, and Di11:2; see also [נֶפֶת].