What is the largest moon of Saturn?

Titan is the largest moon of Saturn and is notable for several reasons. It has a diameter of about 5,151 kilometers, making it larger than the planet Mercury, although it is not as massive as Mercury. Titan is unique among moons in the solar system as it possesses a thick atmosphere primarily composed of nitrogen, with clouds and a hydrological cycle similar to Earth, involving methane and ethane lakes. This atmosphere is so dense that it creates surface pressure about 1.5 times greater than that of Earth, which allows for weather patterns and possibly the presence of liquid on its surface, despite its frigid temperatures.

Additionally, Titan's geological features, including dunes, lakes, and possible cryovolcanoes, suggest that it may have active processes similar to those of Earth. The combination of its size, atmosphere, and potential for complex chemistry makes Titan a subject of great interest for planetary scientists and astrobiologists studying the potential for life beyond Earth.