A peninsula[1][2] is a landform that extends from a mainland and is surrounded by water on most sides.
[3] A peninsula is generally defined as a piece of land surrounded on most sides by water.
Typically, they are built as protection from ocean or sea waves by building a Breakwater, which sometimes connects back to land.
They can also be built to expand areas of a city; for example, Copenhagen is planning to create a peninsula that houses 35,000 residents by 2070.
[27] Sea level rise from global warming will permanently reduce the size of some peninsulas over time.
[30] In history, Peninsulas have played vital role in trade and commerce because of their access to water through an isthmus.
The Malay Peninsula, located at the convergence of the Indian Ocean and the Chinese Seas, played an important role in east-west trade.