dayakkenyah:

ADAT :  customary law of the indigenous people of Indonesia. It was the unwritten, traditional code governing all aspects of personal conduct from birth to death. (Encyclopædia Britannica)

In early 1900s, Van Vollenhoven identified and classified Adat Law of some 19 geographical areas in Indonesia into 19 Rechtskringen (law circles; different systems of customary law in the region) to document the religious aspects of Adat Law, and to characterise the Adat Law of the so-called ‘Foreign Orientals’ (vreemde oosterlingen, such as the Chinese, Arabs and Indians):

1. Aceh: Aceh Besar, Pantai Barat, Singkel, Semeulue
2. Gayo, Alas, and Batak: Tanah Gayo (Gayo Lueus); Tanah Alas; Tanah Batak (Tapanuli): North Tapanuli {Batak Pakpak (Barus) - Batak Karo - Batak Simelungun - Batak Toba (Simsir/Samosir, Balige, Laguboti, Lumban Julu)} and South Tapanuli {Padang Lawas (Tano Sapanjang) - Angkola - Mandailing (Sayurmatinggi)}; Nias (South Nias)
3. Minangkabau: Padang, Agam, Tanahdatar, Limapuluh Kota, Tanah Kampar, Kerinci, Mentawai (Pagai)
4. Sumatera Selatan (South Sumatera): 
5. Melayu: Lingga Riau, Indragiri, Sumatera Timur (East Sumatera), Banjar
6. Bangka and Belitung
7. Kalimantan (Borneo): Dayak, Kapuas Hilir, Kalimantan Tenggara, Mahakam Hilir, Pasir, Dayak Kenyah, Dayak Klemanten, Dayak Landak and Tayan, Dayak Lawangan, Lepo Alim, Lepo Timai, Long Glatt, Dayak Manyaan Patai, Dayak Manyaan Siung, Dayak Nganju, Dayak Otdanum dan Dayak Penyabung Punan
8. Minahasa
9. Gorontalo: Bolaang Mangondow, Boalemo
10. Tana Toraja (Toraja Land) in Sulawesi Tengah (Central Celebes): Toraja Baree, Toraja Barat (West Toraja), Sigi, Kaili, Tawaili, Toraja Sadan, To Mori, To Lainang, Banggai archipelago
11. Sulawesi Selatan (South Celebes): Bugis, Bone, Goa, Laikang, Ponre, Mandar, Makassar, Salaiar, Muna
12. Ternate archipelago: Ternate, Tidore, Halmahera, Tobelo, Sula archipelago
13. Maluku: Ambon, Hitu, Banda, Uliasar archipelago, Saparua, Buru, Seram, Kei archipelago, Aru archipelago, Kisar
14. Irian
15. Timor archipelago: Timor (Timor-Timur, Timor Tengah, Mollo) and Sumba (Sumba Tengah {Central Sumba} and Sumba Timur {East Sumba}, Kodi, Flores, Ngada, Roti, Savu, Bima
16. Bali and Lombok: Tenganan Pagringsingan, Kastala, Karang Asem, Buleleng, Jembrana, Lombok, Sumbawa
17. Jawa Pusat/Tengah (Central Java):  Kedu, Puworejo, Tulungagung - Jawa Timur (East Java): Surabaya - Madura
18. Keraton: Surakarta (Solo), Yogyakarta
19. Jawa Barat (West Java): Pariangan, Sunda, Jakarta, Banten

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(Source: Van Vollenhoven, Het Adatrecht van Nederlandsch Indie, volume I, Leiden, 1925, p. 35. | Photo Source)