The people will be assembled on the Day of Resurrection on a white plain with a reddish tinge like the loaf of white bread with no marks set up for anyone.  

قَالَ رَسُولُ اللَّهِ ﷺ يُحْشَرُ النَّاسُ يَوْمَ الْقِيَامَةِ عَلَى أَرْضٍ بَيْضَاءَ عَفْرَاءَ كَقُرْصَةِ النَّقِيِّ لَيْسَ فِيهَا عَلَمٌ لأَحَدٍ  

I asked Messenger of Allah ﷺ about the words of Allah, the Exalted and Glorious:" The day when the earth would be changed for another earth and Heaven would be changed for another Heaven (XiV. 48), (and inquired: ) (Messenger of Allah), where would the people be on that day? He said: They would be on the Sirat.  

سَأَلْتُ رَسُولَ اللَّهِ ﷺ عَنْ قَوْلِهِ ﷻ { يَوْمَ تُبَدَّلُ الأَرْضُ غَيْرَ الأَرْضِ وَالسَّمَوَاتُ} فَأَيْنَ يَكُونُ النَّاسُ يَوْمَئِذٍ يَا رَسُولَ اللَّهِ فَقَالَ عَلَى الصِّرَاطِ