Otak-otak comes from Palembang cuisine of Palembangese people in South Sumatra, Indonesia and spread throughout to the islands of Sumatra, Java, and Malay Peninsula.
In Indonesia, three cities are famous for their otak-otak; Palembang, Jakarta and Makassar, nevertheless most of coastal fishing towns in Indonesia are familiar with this dish.

On the Bangka island, the town of Belinyu is famous as a production center of otak-otak.

The southern Malaysian town of Muar in Johor is a popular destination for it – people from surrounding states and even Singaporeans often visit to buy the famous otak-otak in bulk.
It is commonly known in Singapore as otah.
Otak-otak comes from Palembang cuisine of Palembangese people in South Sumatra, Indonesia and spread throughout to the islands of Sumatra, Java, and Malay Peninsula. In Indonesia, three cities are famous for their otak-otak; Palembang, Jakarta and Makassar, nevertheless most of coastal fishing towns in Indonesia are familiar with this dish. 
On the Bangka island, the town of Belinyu is famous as a production center of otak-otak.
The southern Malaysian town of Muar in Johor is a popular destination for it – people from surrounding states and even Singaporeans often visit to buy the famous otak-otak in bulk. It is commonly known in Singapore as otah.
Otak-otak