Within Kalimantan Timur and Kalimantan Utara provinces, Basap speakers are scattered across Berau, Bulungan, Kutai Kartanegara, Penajam Paser Utara, and Kutai Timur regencies. Dialects are Jembayan, Bulungan, Berau, Dumaring, Binatang, and Karangan (Ethnologue).
^Basap at Ethnologue (18th ed., 2015) (subscription required)
^Smith, Alexander D. 2018. The Barito Linkage Hypothesis, with a Note on the Position of Basap. JSEALS Volume 11.1 (2018).
^ a bIbrahim, Sjahrial S.A.R.; Effendi, Rustam; Lambut, M.P. (1991). Struktur Bahasa Bosap (in Indonesian). Jakarta: Pusat Pembinaan dan Pengembangan Bahasa, Departemen Pendidikan dan Kebudayaan.