Nephelium maingayi, also known as serait in Malay, mujau in Iban, and buah sungkit in Sabah and Brunei, is a species of flowering plant, a tropical forest fruit-tree in the rambutan family, that is native to Southeast Asia.

[2] The species grows as a tree to 40 m in height with a 6–10 m bole, sometimes with small buttresses.

The inflorescences consist of panicles of flowers without petals.

[2] The species is found on the Malay Peninsula, Borneo and Sumatra, where it occurs in mixed dipterocarp and secondary forests, from lowland flood plains and peat swamps up to 1,600 m in lower montane forest.

[2] Although the species is occasionally cultivated, the fruits are mainly collected from the forest and sold in rural markets.