Great Karimun (Karimun Besar in Indonesian) or just Karimun is one of the islands in the Riau Islands province of Indonesia, administratively part of Karimun Regency. It lies about 37 km southwest of Singapore, 54 km west of Batam, 24 km northeast of Rangsang Island and 32 km north of Kundur Island.
In the past, Karimun was the destination of foreign traders and the Malay Kings. Stamford Raffles is believed to have considered Karimun island instead of Singapore when looking for a settlement.
The island's main city is Tanjung Balai Karimun. As of 2011[update], the regency of Karimun had a population of 272,985 with the majority of the people living in Great Karimun. Notable landmarks on the island include Mount Jantan, the beaches of Pelawan and Pongkar, and the Pongkar Waterfall.
The island has strategic geographical importance, as it is near the Straits of Malacca, an international shipping route. As the island is strategically located at the border of Singapore and Johor (in Malaysia), Karimun being a part of the Riau Islands also is included the SIJORI Growth Triangle partnership. SIJORI (Singapore-Johor-Riau Islands) Growth Triangle is a strategic partnership among Singapore, Johor and Riau Islands that combine the individual and collective strength to improve the subregion attractiveness to investors from both the region and international. SIJORI links the infrastructure, capital, expertise and rich culture of Singapore with the natural resources, lands and labour resources of Johor and Riau Islands.
However, due to the stronger ties between Singapore and Malaysia, Karimun is losing its economic attraction to Singaporean investments. Another reason for the loss in attractiveness is the lack of adequate infrastructure in Karimun, especially electricity supply and the lack of transparency in the government administration.