'High Mountain' in the Bible

The LORD said also unto me in the days of Josiah the king, Hast thou seen that which backsliding Israel hath done? she is gone up upon every high mountain and under every green tree, and there hath played the harlot.

Thy high stomach and the pride of thy heart have deceived thee; Because thou wilt dwell in the holes of stony rocks, and have the high mountains in possession. Nevertheless, though thy nest were as high as the Eagles, yet will I cast thee down, sayeth the LORD.