evidence: The Strait of Johor is situated north of Singapore, between mainland peninsula Malaysia and Singapore.1 The Territorial Waters Agreement of 1927 specified an imaginary line in the Johor Strait as an international boundary. In 1994, a new boundary line was drawn to help resolve future border disputes. There are no marker buoys indicating the actual border line, as this deep waterway is used as a shipping lane. [...] The 50-kilometre-long Strait of Johor sits between Singapore and Johor at the southern tip of the Malay Peninsula. There are two bridges crossing the strait. One is the Causeway, a rail-and-road link between Johor Bahru in Malaysia and Woodlands in Singapore.6 The other, known as the Second Link, connects Tanjung Kupang in Johor and Tuas in Singapore by road only.7 [...] Surveys began in 1982 to properly define the boundary. Talks between Malaysia and Singapore spanned for 14 years before the Boundary Agreement was finalised during their seventh meeting on 14 October 1994. The new boundary was drawn through precise coordinates based on the results of joint hydrographic surveys to determine territorial waters. As the strait is used for shipping, there are no marker buoys to indicate the actual border line for safety reasons.12