Northern arm of the Singapore Strait between the Republic of Singapore and the southern tip of the Malay Peninsula .
It is 30 mi (50 km) long and 0.75 mi (1.2 km) wide. Its eastern portion has a deepwater access channel to Changi naval base on Singapore's northeastern coast. It was the scene of heavy fighting in 1942 during the Japanese drive to conquer Singapore. A causeway links Singapore to the mainland.