The Dolmen of Oppagne, southern dolmen or Wéris II is a portal grave (allée couverte) attributed to the Seine-Oise-Marne culture and is located near Wéris in the territory of the village of Oppagne in the municipality of Durbuy in the Belgian province Luxembourg. The dolmen is located in the fields about a kilometre southwest of the village.
In the area, to the north-east, about 1.5 km away there is another larger and better-known dolmen: the Dolmen of Wéris and in and around the valley in which Wéris is located, there are a number of menhirs. The different megaliths in the environment would form different alignments that are parallel to each other. The dolmen is located in a pit surrounded by four trees, amid the fields.