The region comprising the other 21 provinces in Sumatra, Java, and Kalimantan is known as Western Indonesia.[1][2]
Western Indonesia has a land border with East Malaysia to the North and Peninsular Malaysia to the West
- ^ Badan Riset dan Inovasi Nasional Republik Indonesia (2021-03-19). "Sosialisasi dan Bimtek Indeks Daya Saing Daerah untuk Kawasan Barat Indonesia (Sumatera, Jawa dan Kalimantan) | Berita - Index Daya Saing Daerah (IDSD)". Indeks-inovasi.brin.go.id. Retrieved 2022-04-23.
- ^ Paramitha, Pradna (December 29, 2021). "Western, central, and eastern Indonesia show diverse trends in online shopping behavior". Jakarta: The Jakarta Post. Retrieved November 6, 2023.