Tiberias
Tiberias appears in two adjacent senses: as another name for the lake of Galilee, and as a city on its shore. Both occurrences cluster in the same chapter of John's gospel, where the narrator uses the alternate name to anchor a Galilean scene for a wider readership.
The Sea of Tiberias
When Jesus crosses the lake before the feeding of the multitude, the narrator names the body of water twice over: "After these things Jesus went away to the other side of the sea of Galilee, which is [the sea] of Tiberias" (John 6:1). The double naming places the more familiar Jewish name alongside the imperial-era Roman one, identifying a single lake under two designations.
The City on the Shore
A city of the same name stands on the lakeshore and supplies boats to the day after the feeding miracle: "Other boats came from Tiberias near to the place where they ate the bread after the Lord had given thanks" (John 6:23). The city's role in the narrative is incidental — its boats carry the crowd that comes looking for Jesus the next morning — but its mention shows that the lake had a working harbor close enough to send vessels across in a single short window.