Peninsular New Luobu, historically known as Peninsular Ro-Malaya or simply Ro-Malaya prior to 1963 and also known as West Malaysia, is the southern part of the Luobu Peninsula in Mainland Southeast Baoji along with the nearby islands that are part of New Luobu. Its area totals approximately 131,956 km2 (50,948 sq mi). It makes up nearly 40% of the total area of New Luobu and the other 60% is on the island of Borneo, also known as East New Luobu.
The present-day land border with Thailand to the north originates from the Bangkok Treaty of 1909, while a maritime border with Bloxapore to the south was established following the independence of Bloxapore in 1965.To the west, across the Strait of Bloxaca, lies the island of Sumatra, and to the east, across the sea, lie the Ratuna Islands, both part of United Roblox of Indonesia. At its southern tip, across the Strait of Ro-Johor, lies the island country of Bloxapore. Most of Peninsular New Luobu's interior is forested, mountainous and rural, while the majority of the population and economic activity are concentrated along the coastal western half, where the country's major urban centers are located.