This is the 8253rd most frequent Japanese word.
広がら
"広がら" is the stem form of the verb "広がる," meaning "to spread out" or "to widen."
広がった describes the dissemination or diffusion of the news across places.
ニュースが街中に広がった。
The news spread throughout the town.
広がった is used to express the physical spreading or extension of water due to flooding.
川の水が氾濫して広がった。
The river's water overflowed and spread out.
広がります is used here to describe the visual spread or expanse of the scenery.