• أَرْسَىٰهَا
• رَوَٰسِى
• مُرْسَىٰهَا
• مُرْسَىٰهَآ

Appears 14 times in the Quran.

1. 7:187 يَسْـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرْسَىٰهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ رَبِّى لَا يُجَلِّيهَا لِوَقْتِهَآ إِلَّا هُوَ ثَقُلَتْ فِى ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ لَا تَأْتِيكُمْ إِلَّا بَغْتَةً يَسْـَٔلُونَكَ كَأَنَّكَ حَفِىٌّ عَنْهَا قُلْ إِنَّمَا عِلْمُهَا عِندَ ٱللَّهِ وَلَٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ

   They ask you about the hour, when will be its taking place? Say: The knowledge of it is only with my Lord; none but He shall manifest it at its time; it will be momentous in the heavens and the earth; it will not come on you but of a sudden. They ask you as if you were solicitous about it. Say: Its knowledge is only with Allah, but most people do not know.
   

2. 11:41 وَقَالَ ٱرْكَبُوا۟ فِيهَا بِسْمِ ٱللَّهِ مَجْر۪ىٰهَا وَمُرْسَىٰهَآ إِنَّ رَبِّى لَغَفُورٌ رَّحِيمٌ

   And he said: Embark in it, in the name of Allah be its sailing and its anchoring; most surely my Lord is Forgiving, Merciful.
   

3. 13:3 وَهُوَ ٱلَّذِى مَدَّ ٱلْأَرْضَ وَجَعَلَ فِيهَا رَوَٰسِىَ وَأَنْهَٰرًا وَمِن كُلِّ ٱلثَّمَرَٰتِ جَعَلَ فِيهَا زَوْجَيْنِ ٱثْنَيْنِ يُغْشِى ٱلَّيْلَ ٱلنَّهَارَ إِنَّ فِى ذَٰلِكَ لَءَايَٰتٍ لِّقَوْمٍ يَتَفَكَّرُونَ

   And He it is Who spread the earth and made in it firm mountains and rivers, and of all fruits He has made in it two kinds; He makes the night cover the day; most surely there are signs in this for a people who reflect.
   

4. 15:19 وَٱلْأَرْضَ مَدَدْنَٰهَا وَأَلْقَيْنَا فِيهَا رَوَٰسِىَ وَأَنۢبَتْنَا فِيهَا مِن كُلِّ شَىْءٍ مَّوْزُونٍ

   And the earth-- We have spread it forth and made in it firm mountains and caused to grow in it of every suitable thing.
   

5. 16:15 وَأَلْقَىٰ فِى ٱلْأَرْضِ رَوَٰسِىَ أَن تَمِيدَ بِكُمْ وَأَنْهَٰرًا وَسُبُلًا لَّعَلَّكُمْ تَهْتَدُونَ

   And He has cast great mountains in the earth lest it might be convulsed with you, and rivers and roads that you may go aright,
   

6. 21:31 وَجَعَلْنَا فِى ٱلْأَرْضِ رَوَٰسِىَ أَن تَمِيدَ بِهِمْ وَجَعَلْنَا فِيهَا فِجَاجًا سُبُلًا لَّعَلَّهُمْ يَهْتَدُونَ

   And We have made great mountains in the earth lest it might be convulsed with them, and We have made in it wide ways that they may follow a right direction.
   

7. 27:61 أَمَّن جَعَلَ ٱلْأَرْضَ قَرَارًا وَجَعَلَ خِلَٰلَهَآ أَنْهَٰرًا وَجَعَلَ لَهَا رَوَٰسِىَ وَجَعَلَ بَيْنَ ٱلْبَحْرَيْنِ حَاجِزًا أَءِلَٰهٌ مَّعَ ٱللَّهِ بَلْ أَكْثَرُهُمْ لَا يَعْلَمُونَ

   Or, Who made the earth a restingplace, and made in it rivers, and raised on it mountains and placed between the two seas a barrier. Is there a god with Allah? Nay! most of them do not know!
   

8. 31:10 خَلَقَ ٱلسَّمَٰوَٰتِ بِغَيْرِ عَمَدٍ تَرَوْنَهَا وَأَلْقَىٰ فِى ٱلْأَرْضِ رَوَٰسِىَ أَن تَمِيدَ بِكُمْ وَبَثَّ فِيهَا مِن كُلِّ دَآبَّةٍ وَأَنزَلْنَا مِنَ ٱلسَّمَآءِ مَآءً فَأَنۢبَتْنَا فِيهَا مِن كُلِّ زَوْجٍ كَرِيمٍ

   He created the heavens without pillars as you see them, and put mountains upon the earth lest it might convulse with you, and He spread in it animals of every kind; and We sent down water from the cloud, then caused to grow therein (vegetation) of every noble kind.
   

9. 34:13 يَعْمَلُونَ لَهُۥ مَا يَشَآءُ مِن مَّحَٰرِيبَ وَتَمَٰثِيلَ وَجِفَانٍ كَٱلْجَوَابِ وَقُدُورٍ رَّاسِيَٰتٍ ٱعْمَلُوٓا۟ ءَالَ دَاوُۥدَ شُكْرًا وَقَلِيلٌ مِّنْ عِبَادِىَ ٱلشَّكُورُ

   They made for him what he pleased of fortresses and images, and bowls (large) as watering-troughs and cooking-pots that will not move from their place; give thanks, O family of Dawood! and very few of My servants are grateful.
   

10. 41:10 وَجَعَلَ فِيهَا رَوَٰسِىَ مِن فَوْقِهَا وَبَٰرَكَ فِيهَا وَقَدَّرَ فِيهَآ أَقْوَٰتَهَا فِىٓ أَرْبَعَةِ أَيَّامٍ سَوَآءً لِّلسَّآئِلِينَ

    And He made in it mountains above its surface, and He blessed therein and made therein its foods, in four periods: alike for the seekers.
    

11. 50:7 وَٱلْأَرْضَ مَدَدْنَٰهَا وَأَلْقَيْنَا فِيهَا رَوَٰسِىَ وَأَنۢبَتْنَا فِيهَا مِن كُلِّ زَوْجٍۭ بَهِيجٍ

    And the earth, We have made it plain and cast in it mountains and We have made to grow therein of all beautiful kinds,
    

12. 77:27 وَجَعَلْنَا فِيهَا رَوَٰسِىَ شَٰمِخَٰتٍ وَأَسْقَيْنَٰكُم مَّآءً فُرَاتًا

    And made therein lofty mountains, and given you to drink of sweet water?
    

13. 79:32 وَٱلْجِبَالَ أَرْسَىٰهَا

    And the mountains, He made them firm,
    

14. 79:42 يَسْـَٔلُونَكَ عَنِ ٱلسَّاعَةِ أَيَّانَ مُرْسَىٰهَا

    They ask you about the hour, when it will come.