Lake Horowhenua 3.21

Lake Horowhenua is located in the Horowhenua, an area of the southern Manawatu-Wanganui region in New Zealand's North Island. It covers an area of 3.9km2.The lake, also known as Punahau, lies on a sandy plain 2km west of Levin and 5km from the coast of the Tasman Sea. It is a shallow lake, only some 2m deep, fed by various small streams, and is drained by the Hokio Stream.HistoryThe lake was once surrounded by podocarp forest as the centre of a rich wetland ecosystem. Today the trees are gone and the wetland has been substantially drained. The lake is owned by the Māori Muaūpoko iwi, who, with the help of the Horowhenua Lake Trust, are actively attempting to restore the wetland system (that also contains the smaller Lake Papaitonga) to its former state as a conservation area.In the 1820s the Muaūpoko were attacked by Te Rauparaha and the Ngati Toa. Two island pā on the lake were destroyed and heavy casualties suffered by the Muaūpoko people.Water QualityBetween 1952 and 1987 treated sewage from Levin was dumped into the lake. This has contributed significantly to the current eutrophic state of the lake.