"In Paradise, there are a hundred levels, what is between every two levels is like what is between the heavens and the earth. Al-Firdaus is ts highest level, and from it the four rivers of Paradise are made to flow forth. So when you ask Allah, ask Him for Al-Firdaus." Another chain reports a similar narration.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ فِي الْجَنَّةِ مِائَةُ دَرَجَةٍ مَا بَيْنَ كُلِّ دَرَجَتَيْنِ كَمَا بَيْنَ السَّمَاءِ وَالأَرْضِ وَالْفِرْدَوْسُ أَعْلاَهَا دَرَجَةً وَمِنْهَا تُفَجَّرُ أَنْهَارُ الْجَنَّةِ الأَرْبَعَةُ وَمِنْ فَوْقِهَا يَكُونُ الْعَرْشُ فَإِذَا سَأَلْتُمُ اللَّهَ فَسَلُوهُ الْفِرْدَوْسَ حَدَّثَنَا أَحْمَدُ بْنُ مَنِيعٍ حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ حَدَّثَنَا هَمَّامٌ عَنْ زَيْدِ بْنِ أَسْلَمَ نَحْوَهُ