Baile Mhargaite (also known as Lochan Druim An Duin, the Sandy Dun, or Invernaver Broch) is an Iron Age broch in Strathnaver, Sutherland.

[1] Baile Mhargaite broch (also referred to as Sandy Dun or Invernaver broch) has a visible circumference of roughly 8.5 meters, though the broch structure itself is fairly tumbled and filled with stone rubble and sand.

North of the possible entrance is a short stretch of a base course of stones, and there are further potential wall remains adjacent to the access way.

On the other three sides the broch was protected by steep rock slopes.

In addition to the ditch there are also remains of an outer wall on the west side, though the poor state of preservation makes it difficult to assess the extent of this defensive wall.