washland

noun

1. (countable, uncountable)Any land that is flooded by a river from time to time.

   “Martyn Wilson, senior asset manager (geotechnics), explains: "In that part of Yorkshire, more than 3,000 acres of washlands had been allowed to flood [in line with the Environment Agency's local flood management plan]. That's 80% of the size of Windermere, so when it floods it becomes the second-largest lake in England.”