سلطنة جوهر
In addition, Singapore claimed that the old Johor Sultanate, which controlled a maritime Malay empire from a capital on the Johor River, was not the same as the new Johor Sultanate occupying only the southern tip of the Malay Peninsula that came into existence after the signing of the Anglo–Dutch Treaty of 1824 between the United Kingdom and the Netherlands. In its view, the Anglo–Dutch Treaty did not divide up the Singapore Strait, in which Pedra Branca is situated, between the new Johor Sultanate under the British sphere of influence and the Riau-Lingga Sultanate under Dutch influence. Instead, both Britain and the Netherlands could access the Strait freely. Therefore, there was a legal vacuum with regard to sovereignty over the island, enabling the British to lawfully take possession of it between 1847 and 1851.