Assertion: desert's elevation | /r/HasProperty | northwestern corner
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Source sentences:
text: Three corners have high elevations: the southwestern corner in Yemen, where Mount Al-Nabī Shuʿayb reaches the desert’s highest elevation, 12,336 feet (3,760 metres); the northwestern corner in Hejaz (Al-Ḥijāz; a part of Saudi Arabia), where Mount Al-Lawz rises to 8,464 feet (2,580 metres); and the southeastern corner in Oman, where Mount Al-Shām attains an elevation of 9,957 feet (3,035 metres).