Verse 1
John 21:1
After these things -- With the weeklong festival of Unleavened Bread past the disciples have left Jerusalem and returned to Galilee where Jesus had promised to meet them. ( John 20:26; Luke 2:43 )
John seems to write this epilogue to tie up several loose ends, Peter’s restoration and service, and a rumor about himself.
Sea of Tiberias -- Sea of Galilee (John 6:1) cf Luke 5:1;
Tiberias was the Roman administrative capital of Galilee. This body of water is also known as the “Sea of Galilee” (cf. John 6:1) or Lake of Gennesaret (cf. Matthew 14:34; Mark 6:35; Luke 5:1) and in the OT as “Lake of Chinnereth” (cf. Numbers 34:11; Deuteronomy 3:17; Joshua 11:2; Joshua 12:3; Joshua 13:27; Joshua 19:35; 1 Kings 15:20).