Location and position in the Malacca Strait between Sumatra and the Malay
peninsula that stretches from north to south to the Riau Islands and turned to the
East. The waterway length less than 900 nautical miles, with an average width of 8.3
nautical miles where the narrowest place is located in Karimun (Indonesia) and the
Kutub Island (Malaysia) which has width is only 8.4 nautical miles. Narrowest place in
the Singapore Strait lies between Happy Island (Singapore) and Takong Island
(Indonesia) wide and 3.2 nautical miles and between the St. John Island and Sambo
Island 3.4 nautical miles wide.5