Revelation 4:6

4:6 and in front of the throne was something like a sea of glass, like crystal.

In the middle of the throne and around the throne were four living creatures full of eyes in front and in back.

Revelation 21:1

A New Heaven and a New Earth

21:1 Then I saw a new heaven and a new earth, for the first heaven and earth had ceased to exist, and the sea existed no more.

Revelation 20:13

20:13 The sea gave up the dead that were in it, and Death and Hades gave up the dead that were in them, and each one was judged according to his deeds.