The phrase "large peninsula" refers to a piece of land that is connected to the mainland by a narrow strip but is surrounded by water on three sides. Full definition
Large peninsula in the kitchen connects to the family room with fireplace. (zillow.com)
Large peninsula sit up island is part of the kitchen / great room which seamlessly flows into dining then sitting room with a cozy cast iron fireplace. (phoenixrealestateguy.com)
The Leizhou Peninsula is the third largest peninsula in China with an area of c. 8,500 square kilometers (3,300 sq mi) located on the southwestern end of Guangdong, with the Gulf of Tonkin to the west and the 30 km wide Qiongzhou Strait to the south, separating the peninsula from Hainan Island. (en.wikipedia.org)