Hrušica (; German: ''Birnbaumer Wald'' iterally, 'pear tree forest' Italian: ''Selva di Piro'') is a plateau at the northern end of the Postojna Gate. The plateau can be viewed as the end or extension of the Trnovo Forest Plateau (), and to the west is Mount Nanos. The

limestone Limestone is a type of carbonate rock, carbonate sedimentary rock which is the main source of the material Lime (material), lime. It is composed mostly of the minerals calcite and aragonite, which are different Polymorphism (materials science) ...

plateau reaches an elevation of 1,080 m, while the road crosses it at 883 m. Because the Postojna Gate is crossed at a lower point of 606 m at nearby

Postojna Postojna (; , ) is a town in the traditional region of Inner Carniola, from Trieste, in southwestern Slovenia. It is the seat of the Municipality of Postojna.

, modern traffic including the railroad and the freeway bypass Hrušica. Hrušica was the location of an ancient Roman Fortress called Ad Pirum, which was part of the Claustra Alpium Iuliarum defence system.

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* {{Slovenia-geo-stub