Batak Dairi  
Indigenous Group Batak Dairi (Also known as: Dairi, Dairi Batak, Orang Batak Dairi, Pakpak, Pakpak Dairi, Sumut)
Location Indonesia, island of Sumatra, Sumatera Utara Province, Dairi District, southwest of Lake Toba, near Sidikalang
Estimated Population 1,200,000 (1991, SIL International)
Environment Highland Rainforest
Lifestyle Sedentary
Subsistence Agriculture / Fishing / Hunting / Textiles / Handicraft Sales/ Paid Labor
Level of Assimilation Assimilated
Language Family Batak Dairi
Classification: Austronesian, Malayo-Polynesian, Sundic, Sumatra, Batak, Northern
Alternate names: Dairi, Dairi Batak, Orang Batak Dairi, Pakpak, Pakpak Dairi, Sumut 
Dialects: Closely related to Toba Batak, but distinct sociolinguistically.
Website URLs Batak of Sumatra Homepage
Dairi
Ethnologue
Royal Netherlands Institute of Southeast Asian and Caribbean Studies (KITLV)
Wikipedia: Batak (Dairi, as ethnic subset of Batak group)
1993 Library of Congress Report (Batak cultural overview, statistics)
Four Diari Subdistricts Want New Regency
The Situation of Indigenous Peoples in Tropical Forests
Experience and Lessons Learned Brief for Lake Toba
Feasibility Study for the Lake Toba Science and Education Center
NGOs Bona Ni Pasogit (Association of Batak Tribes in Europe)
YAPIDI (Pijer Podi Foundation)
Yayasan Ekowisata Sumatra (YES, or Sumatra EcoTourism Foundation)
UNESCO (Jakarta office)
World Rainforest Movement
Down To Earth
The Corner House