Opened Rabbi El’azar and said: ‘Father! But there are seven seas,viiSee BT Baba Batra 74b and higher sea is above all of them, and it is stated about it: (Deut. 33:19)... for the bounty of the seas will they suckle... To whom do they give suckle?’
He said to him: ‘My son, (Zech. 4:2)... seven into seven... are... tubes. And thus are the firmaments – seven into seven, and thus are the mountains – seven into seven, and so are the lands – seven into seven, the settlements – seven into seven, and their heads are two, and the mystery of the matter: (Gen. 7:9) Two by two... (Gen. 7:2)... seven by seven... and all are male and female, and above, is one that is concealed and hidden, and so are the seven thrones – seven into seven, seven chambers – seven into seven, and so are ‘the appointed’ angels – seven and seven.viiiSee Pirqei de-Rabbi Eli’ezer Ch.4