Peninsular Malaysia (Semenanjung Malaysia; Jawi: سمننجڠ مليسيا; 马来西亚半岛; Tamil: தீபகற்ப மலேசியா), historically known as Malaya (Tanah Melayu; Jawi: تانه ملايو), also known as West Malaysia or the Malaysian Peninsula, is the part of Malaysia that occupies the southern half of the Malay Peninsula in Southeast Asia and the nearby islands. Its area totals approximately , which is nearly 40% of the total area of the country; the other 60% is in East Malaysia on the island of Borneo.
It shares a land border with Thailand to the north and a maritime border with Singapore to the south. Across the Strait of Malacca to the west lies the island of Sumatra, and across the South China Sea to the east lie the Natuna Islands of Indonesia. At its southern tip, across the Strait of Johor, lies the island country of Singapore. Most of Peninsular Malaysia's interior is forested, mountainous and rural; the majority of Malaysia's population and economy are concentrated on the coastal western half, which