Tafsir of Ta-Ha 20:107

You will see therein no crookedness nor curve. meaning, `on that Day you will not see in the earth any valley, hill, or any place, whether low or elevated.' Ibn Abbas, Ikrimah, Mujahid, Al-Hasan Al-Basri, Ad-Dahhak, Qatadah and others of the Salaf all said the same. The People will rush towards the Voice of the Caller Allah says,