Sotonera Lacus (Titan)

Lake in Spain.

Sotonera Lacus is one of a number of hydrocarbon lakes found on Saturn's largest moon, Titan. Sotonera Lacus is located near the north pole of Titan, centered on latitude 76.75°N and longitude 17.49°W, and measures 63 km in length. It is situated in a north polar region where the majority of Titan's large lakes are found. The lake is composed of liquid methane and ethane, and was detected by the space probe Cassini. (wikipedia entry)

A lacus is a "lake" or small, dark plain with discrete, sharp boundaries. On Titan they are named after lakes on Earth, preferably with a shape similar to the lacus or lacuna on Titan.