This is the 15400th most frequent Russian word.
правобережной
"Правобережной" means "right-bank" (located on the right side of a river).
The term 'правобережной' here modifies 'стороне', indicating the city's position relative to the river on the right bank.
Город расположен на правобережной стороне реки.
The city is located on the right bank side of the river.
'Правобережной' describes the 'территории', specifying the area on the right bank of the river.
После паводка дороги на правобережной территории были повреждены.
After the flood, roads in the right bank area were damaged.
The adjective 'правобережной' modifies 'зоне', denoting the associated area situated on the right bank.