A strait is a narrow, typically navigable waterway that connects two larger, navigable bodies of water. It most commonly refers to a channel of water that lies between two land masses, but it may also refer to a navigable channel through a body of water that is otherwise not navigable, for example because it is too shallow, or because it contains an unnavigable reef or archipelago.
The Singapore Strait (or Straits of Singapore; simplified Chinese: 新加坡海峡; traditional Chinese: 星加坡海峽; pinyin: Xīnjiāpō Hǎixiá Malay: Selat Singapura) is a 105-kilometer long, 16-kilometer wide strait between the Strait of Malacca in the west and the South China Sea in the east. Singapore is on the north of the channel and the Riau Islands are on the south. The Indonesia-Singapore border lies along the length of the straits.
The depth of the Singapore Strait defines the maximum draft of vessels going through the Straits of Malacca, and the Malaccamax ship class.