Lake Horowhenua is a shallow, three-square-kilometre lake on the western edge of Levin, ringed by farmland and a handful of small reserves. The lake is best known historically as a Muaūpoko stronghold and continues to be owned by the iwi today; the surrounding land has been the subject of long-running disputes over water quality, dating from when the surrounding farms began intensive draining in the early 20th century.
The Domain on the eastern shore is the easiest public access point, with a short loop walk through wetland and out to a viewing platform. Water quality issues mean swimming is not advisable, but the lake is good for birdwatching — kotuku (white heron) and several duck species are regulars, and the surrounding wetland reserves support fernbird and bittern.