Collocations for countryside - noun

attractive (esp. BrE), beautiful, glorious (BrE), lovely, magnificent (esp. BrE), picturesque, spectacular (esp. BrE), stunning (esp. BrE), wonderful (esp. BrE)
unspoiled
miles of unspoiled countryside

open
green, lush
a walk through the lush green countryside

flat
hilly, mountainous, rolling, rugged
wild (esp. BrE)
peaceful, quiet, rural (esp. AmE)
local (esp. BrE), nearby, surrounding
English, French, etc.

area (esp. BrE)
acres, miles
miles of beautiful countryside

conserve, preserve, protect (all esp. BrE)
ravage (esp. BrE)
The countryside has been ravaged by pollution.

roam, tour, wander, wander around, wander through
In the afternoons they roamed the countryside around the house.

scour
Police scoured the countryside in search of the missing man.

dot
Castles and churches dot the countryside.

in the countryside
I dream of living in the countryside.

surrounded by countryside
a small town surrounded by picturesque countryside

through (the) countryside
Soon we were driving through pleasant open countryside.

countryside around
the countryside around Oxford