The greatness of the Arsh of Allah Subhana wa ta'Ala

 The greatness of the Arsh of Allah Subhana wa ta'Ala 

Alhamdulillah, As we know from the Qur'an and hadith, Allah s.w.t has a throne 

Allah says,

Ṭā Hā 20:5

ٱلرَّحۡمَٰنُ عَلَى ٱلۡعَرۡشِ ٱسۡتَوَىٰ

The Most Merciful [who is] above the Throne established.[1]

Allah s.w.t has a throne and the throne is above the water 

As reported in hadith,

Narrated Waki' bin Hu'dus from his uncle Abu Razin who said: "I said: 'O Messenger of Allah! Where was our Lord before He created His creation?' He said: 'He was (above) the clouds - no air was under him, no air was above him, and He created His Throne upon the water.'"'

Vol. 5, Book 44, Hadith 3109..

Narrated Abu Huraira:

The Prophet (ﷺ) said, "Whoever believes in Allah and His Apostle, offer prayer perfectly and fasts the month of Ramadan, will rightfully be granted Paradise by Allah, no matter whether he fights in Allah's Cause or remains in the land where he is born." The people said, "O Allah's Messenger (ﷺ) ! Shall we acquaint the people with the is good news?" He said, "Paradise has one-hundred grades which Allah has reserved for the Mujahidin who fight in His Cause, and the distance between each of two grades is like the distance between the Heaven and the Earth. So, when you ask Allah (for something), ask for Al-firdaus which is the best and highest part of Paradise." (i.e. The sub-narrator added, "I think the Prophet also said, 'Above it (i.e. Al-Firdaus) is the Throne of Beneficent (i.e. Allah), and from it originate the rivers of Paradise.")")

Sahih al-Bukhari 2790.

But we do not know how the throne of Allah is or how he is above his throne