In Revelation 21:1-7 NIV we read the following:
Then I saw “a new heaven and a new earth,” for the first heaven and the first earth had passed away, and there was no longer any sea. 2 I saw the Holy City, the new Jerusalem, coming down out of heaven from God, prepared as a bride beautifully dressed for her husband. 3 And I heard a loud voice from the throne saying, “Look! God’s dwelling place is now among the people, and he will dwell with them. They will be his people, and God himself will be with them and be their God. 4 ‘He will wipe every tear from their eyes. There will be no more death’[b] or mourning or crying or pain, for the old order of things has passed away.”
5 He who was seated on the throne said, “I am making everything new!” Then he said, “Write this down, for these words are trustworthy and true.”
6 He said to me: “It is done. I am the Alpha and the Omega, the Beginning and the End. To the thirsty I will give water without cost from the spring of the water of life. 7 Those who are victorious will inherit all this, and I will be their God and they will be my children.“
And a description of the New Jerusalem is provided as follows:
Rev 21:10 – 22:5 10 “And he carried me away in the Spirit to a mountain great and high, and showed me the Holy City, Jerusalem, coming down out of heaven from God. 11 It shone with the glory of God, and its brilliance was like that of a very precious jewel, like a jasper, clear as crystal. 12 It had a great, high wall with twelve gates, and with twelve angels at the gates. On the gates were written the names of the twelve tribes of Israel. 13 There were three gates on the east, three on the north, three on the south and three on the west.14 The wall of the city had twelve foundations, and on them were the names of the twelve apostles of the Lamb.
15 The angel who talked with me had a measuring rod of gold to measure the city, its gates and its walls. 16 The city was laid out like a square, as long as it was wide. He measured the city with the rod and found it to be 12,000 stadia[a] in length, and as wide and high as it is long. 17 The angel measured the wall using human measurement, and it was 144 cubits[b] thick.[c] 18 The wall was made of jasper, and the city of pure gold, as pure as glass. 19 The foundations of the city walls were decorated with every kind of precious stone. The first foundation was jasper, the second sapphire, the third agate, the fourth emerald, 20 the fifth onyx, the sixth ruby, the seventh chrysolite, the eighth beryl, the ninth topaz, the tenth turquoise, the eleventh jacinth, and the twelfth amethyst.[d]21 The twelve gates were twelve pearls, each gate made of a single pearl. The great street of the city was of gold, as pure as transparent glass.
22 I did not see a temple in the city, because the Lord God Almighty and the Lamb are its temple. 23 The city does not need the sun or the moon to shine on it, for the glory of God gives it light, and the Lamb is its lamp. 24 The nations will walk by its light, and the kings of the earth will bring their splendor into it. 25 On no day will its gates ever be shut, for there will be no night there. 26 The glory and honor of the nations will be brought into it.27 Nothing impure will ever enter it, nor will anyone who does what is shameful or deceitful, but only those whose names are written in the Lamb’s book of life.
22 Then the angel showed me the river of the water of life, as clear as crystal, flowing from the throne of God and of the Lamb 2 down the middle of the great street of the city. On each side of the river stood the tree of life, bearing twelve crops of fruit, yielding its fruit every month. And the leaves of the tree are for the healing of the nations. 3 No longer will there be any curse. The throne of God and of the Lamb will be in the city, and his servants will serve him. 4 They will see his face, and his name will be on their foreheads. 5 There will be no more night. They will not need the light of a lamp or the light of the sun, for the Lord God will give them light. And they will reign for ever and ever.”
Hard to envision isn’t it but this is what the Revelation of Jesus Christ tells us. A new earth and a new Jerusalem. And how big is new Jerusalem, it’s big, really big. Most envision the New Jerusalem as a cube, a big cube. 12,000 stadia in length, width and height.
The term stadia comes from the plural of the Greek stadion, the word for a distance of 185 to 192 metres (607-630 ft). A very similar length is the modern furlong, or eighth of a mile, 660 ft. So depending on which measuring term you use, stadia or furlong, the New Jerusalem would be approximately 1,400 miles (stadia) or 1,500 miles (furlong) square. In kilometers that would be approximately 2,200 kilometers for stadia or 2,414 kilometers for furlongs. The reason I mention furlong versus stadia is that some Bible translations use stadia and some use furlong. Sticking with stadia we end up with a cube approximately 1,400 miles square or 2,200 kilometers square (thats 144,000,000 square stadia).
John 14:2 (KJV)
2 In my Father’s house are many mansions: if it were not so, I would have told you. I go to prepare a place for you.