Lake Mežmuižas (also known as Lake Sloku and Lake Mežkunga) is a subglacial lake located in Renda Parish, Kuldīga Municipality, belonging to the Mordanga lake group.
The lake has an average depth of 2.7 meters and a maximum depth of 4.6 meters. It features sloping shores and a muddy bed. The Meķupe River flows out of the lake towards Lake Usma. The lake's fish population includes pike, perch, cruchan carp, and tench, while aquatic plants such as reeds, bulrushes, water lilies, and pondweeds grow along the coastline.
On the shore of the lake lies the former Mežmuiža manor complex and a protected natural monument — the Ezeru Great Oak. A public swimming area is available by the lake.