What is "twmbarlwm"

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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 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 600m. It is high and is a well known landmark throughout the region. It commands extensive views across what is now the M4 corridor, over Newport and Cwmbran and out over the Bristol Channel.