Indonesian is also ranked as having the second-largest number of languages ​​in the world, second only to Papua New Guinea with 820 languages. The highly fragmented geography may be the main reason for the birth of so many languages. Indonesia has more than 17,500 islands with more than 1,300 ethnic groups, with the isolation of the islands, many language groups have been born.

Indonesian (Bahasa Indonesia) is the official language of Indonesia. Indonesian and Malaysian have many similarities, so Indonesians can communicate with Bruneians and Malaysians if they speak it. And since Indonesia’s area ranks 14th worldwide, Indonesian is also the most widely spoken Malay language with over 170 million speakers.

Indonesian is part of the Western Malayo-Polynesian subgroup, a branch of the Austronesian languages. According to Ethnologue, Indonesian was formed after Riau Malay, an old form of Malay originally spoken in Northeastern Sumatra.

According to seasia.co

(https://seasia.co/2022/01/25/indonesia-ranks-2-on-countries-with-the-most-languages-here-s-the-complete-list-list)