The Terai is a region of marshy jungle beneath the lower southern ranges of the Himalayas in the border region between Nepal and India. It is a roughly 30km wide belt of a fertile alluvial plain along the border, only a few metres above sea level. In between the sparsely forested Chure hills, rising abruptly to the north of the southern plains and the Mahabharat range, there are a number of low valleys called "Duns". The Duns resemble the Terai in both their topography and their climate and are thus also known as the "Inner Terai". The Terai and the Siwalik areas lie in the foothills of the Nepalese Himalayas and are known for their sedimentary basins of considerable thickness. Terai and Siwalik are thus target areas for oil and gas exploration.

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