עַ֤ל הַר־גָּבֹ֙הַּ֙ וְנִשָּׂ֔א שַׂ֖מְתְּ מִשְׁכָּבֵ֑ךְ גַּם־שָׁ֥ם עָלִ֖ית לִזְבֹּ֥חַ זָֽבַח׃
你在高聳的山上安設你的床；你也上到那裡去獻祭。
Rashi
you placed your couch The couch of your adultery to idolatry on the high mountains.
Ibn Ezra
Upon a lofty and high mountain, etc. Like a harlot that commits adultery in an open place, that is, publicly.