Восточном

28 Э́то происходи́ло в Вифа́нии,

28 [That, This, It] [happened, happening, it was happening] [at, in, of, on] [Bethabara, Bethany],

на восто́чном берегу реки Иорда́на,

[at, by, in, it, on the, to, toward, upon] eastern [coast, shore] rivers Jordan,

там,

there,

где крести́л Иоа́нн.

[somewhere, where, wherever] [baptize, baptized, baptizing] John.

These things took place in Bethany across the Jordan,
where John was baptizing.
John 1:28 ESV

These things were done in Bethabara beyond Jordan,
where John was baptizing.
John 1:28 KJV

Восто́чном ( Eastern )