The correct answer would be, Dolmens.
A term used for portal tombs is called Dolmens.
Explanation:
A portal tomb is termed as Dolmen. Dolmens are basically a megalithic tomb structure.
Dolmens are found mainly in France and Great Britain. These are basically consist of a large flat stone that is laid upon some upright stones.
They usually give an impression that upright stones are carrying a big flat stone upon them, giving it a shape of some shelter.
They were described normally as monuments. Dolmens are also called the Chambered tombs.
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