From malach (in its denominative sense); properly, salted (i.e. Land ('erets being understood)), i.e. A desert -- barren land(-ness), salt (land).
see HEBREW malach
see HEBREW 'erets
H4420. melechah
מְלֵחָה noun feminine saltness, barrenness; — Job 39:6 ("" עֲרָבָה) as dwelling-place of wild ass, salt-plain; מְלֵחָה אֶרֶץ Jeremiah 17:6 ("" תֵשֵׁב לֹא); Psalm 107:34 (opposed to מְּרִי אֶרֶץ).