From an unused root meaning to step; properly, a step; by implication, a steep or inaccessible place -- stair, steep place.
H4095. madregah
מַדְרֵגָה noun feminine steep place, steep, — ׳מ Song of Solomon 2:14 ("" סֶ֫לַע), plural הַמַּדְרֵגוֺת Ezekiel 38:20 ("" ההרים and חומה).