épinière means “briar patch” | MotiTan French Dictionary

More examples

Le sentier était bordé d'une épinière qui gênait la marche.

The path was bordered by a thorny thicket that hindered walking.

A dense tangle of thorny shrubs forming a barrier that is difficult to cross.

buisson: A dense growth of low shrubs forming a thicket.
fourré: Dense undergrowth of young trees and branches that is hard to penetrate.

Endroit couvert d'arbustes ou de ronces portant beaucoup d'épines, formant un obstacle.

French épinière is formed from épine, ultimately from Latin spina, with the suffix -ière used for a place characterized by something.

Épinière is a feminine noun, so standard usage has une épinière and cette épinière.