Toba Batak Mask From Batak ( Toba Island Sumatra ), 20 century. Height 30 cm , widht 38 cm, Weight 2 kg. The Batak people in northern Sumatra wear masks, which are also associated with the cult of the dead and funeral rituals. The most famous are those from the Toba-Batak group who live around Lake Toba and on the island of Samosir, which is located in this lake. The mask takes the shape of an elongated human face, as wide as it is from the top edge to the mouth.