"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. (Using translation from Tirmidhī 2531)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْجَنَّةُ مِائَةُدَرَجَةٍ مَا بَيْنَ كُلِّ دَرَجَتَيْنِ مِنْهُمَا كَمَا بَيْنَ السَّمَاءِ وَالْأَرْضِ الْفِرْدَوْسُ أَعْلَاهَا دَرَجَةً وَمِنْهَا تُفَجَّرُ أَنْهَارُ الْجَنَّةِ الْأَرْبَعَةُ وَمِنْ فَوْقِهَا يَكُونُ الْعَرْشُ وَإِذَا سَأَلْتُمُ اللهَ فَاسْأَلُوهُ الْفِرْدَوْسَ