Pedra Branca, also known as Batu Putih, is an outlying island and the easternmost point of Singapore. The name of the island, which is Portuguese for "white rock", refers to whitish guano deposited on the rock. From Wikipedia
A royal commission alleges Mahathir Mohamad misled the government in 2018, leading to the withdrawal of Malaysia's challenge to an ICJ ruling favoring Singapore.
