nullah
A stream-bed, ravine, or other watercourse; a drain for rain or floodwater.
About this time a large gole of horsemen came on towards me, and I proposed to charge; but as they turned at once from the fire of the guns, and as there was a nullah in front, I refrained from advancing after them.
An open-air, concrete-lined channel for draining rain or wastewater; a storm drain.
On all sides, wild mountains rise precipitously above wooded nullahs, and we have a clear view, to the right, of the famous Amah Rock, with its singular resemblance to a Chinese woman carrying her baby on her back in the traditional fashion.
Where it comes from
Borrowed from Bengali নালা (nala), Hindi नाला (nālā), from Sanskrit नाडी (nāḍī).
Adapted from the Wiktionary entry nullah (CC BY-SA 4.0).