Kuk Swamp is an archaeological site in New Guinea, that lies in the Wahgi Valley. It is the result of a former lake basin, filled by an alluvial fan or deposits of water-transported material. The Kuk creek must flow through the entirety of the fan to a catchment in the lower hills of the south region. Early channels that were created flowed this water past the reach of the fan. If these channels were to be blocked, as evidence suggests, it would turn into a swamp, diverting the water into smaller distributary channels. Evidence for early agricultural drainage systems was found here, beginning about 9,000 years ago. Features such as pits, postholes and runnels have been found at the site, which provide evidence for early agriculture. Such features are consistent with planting, digging and tethering of plants. Evidence has been found of irrigation draining ditches dating back to 9,000 years ago, with a number of plants including taro grown, at what would have been the edge of its cultivable limit in the highlands. These ditches can be divided into three types: major disposal channels, large field ditches, and small field ditches.