Lake Parangi is a small supertrophic (i.e. saturated in phosphorus and nitrogen, with excessive phytoplankton growth after a few weeks of calm, sunny weather),[1] dune-dammed lake 3 km north of Kawhia in the Waikato region of New Zealand.

In 1937, Lake Parangi was described by the Evening Post as having, "a steep sand-cliff at one end of it and is reputed to be bottomless.

Here and there are groves of gnarled pohutukawas, serving as valuable landmarks in the Sahara-like wilderness of the dunes.

"[2] Lake Parangi has freshwater mussels, eels, pondweed Potamogeton ochreatus and watermilfoil Myriophyllum triphyllum.

Catfish have been introduced and water quality is deteriorating.