From shaphel; Lowland, i.e. (with the article) the maritime slope of Palestine -- low country, (low) plain, vale(-ley).
see HEBREW shaphel
H8219. shephelah
שְׁפֵלָה noun feminine lowland; — always absolute ׳שׁ with article, except suffix שְׁפֵלָתֹה Joshua 11:16; — lowland:
1 usually technical term of strip west of Judaean mountains (on exact limits see GASmGeogr. 201 ff.; Expos. Dec. 1896, 404 f. BuhlGeogr. 104 DrHast. DB iii. 892 f.): almost always distinguished from הָהָר and הַנֶּגֶב, sometimes from הָעֲרָבָה, in Deuteronomy 1:7; Joshua 9:1 (RD), also from הַיָּם חוֺף, compare 10:40; 12:8 (both RD), Judges 1:9 (perhaps RD, compare Bu GFM), Joshua 15:33 (P), Jeremiah 17:26; 32:44; 33:13; Obadiah 19; Zechariah 7:7; 2 Chronicles 26:10 (distinguished from הַמִּישׁוֺר, table-land east of Jordan); region of sycomores 1 Kings 10:27 2 Chronicles 1:15; 9:27; 1 Chronicles 27:28.
2 of lowland (near coast) north of Carmel Joshua 11:2; west of mountains of Ephraim 11:16 (both RD).