Twmbarlwm, also known as Twm Barlwm, Twyn Barlwm or locally known as "the Twmp" (translation: hump) or the Pimple because of the mound that lies at its summit, is a hill situated 2 km (1.2 mi) to the northeast of Risca in South Wales. It is often mistakenly referred to as a mountain but is actually a hill due to being under 600 m (2,000 ft).