These things were done in Bethabara beyond Jordan, where John was baptizing.
Berean Study Bible (BSB) - John 1:28 >All this happened at Bethany beyond the Jordan, where John was baptizing.
Textus Receptus (TR) - John 1:28 >Ταῦτα ἐν Βηθαβαρᾶ ἐγένετο πέραν τοῦ Ἰορδάνου, ὅπου ἦν Ἰωάννης βαπτίζων.