At 400,000 km², Kraken Mare is thought to be the largest body of liquid in Titan's north polar region. The maximum depth appears to be 160 meters and shallow capillary waves 1.5 centimeters high moving at 0.7 meters per second have been detected.  Its status as a sea of hydrocarbons (mainly liquid methane) was identified by radar imagery. Kraken Mare is thought to be larger than the Caspian Sea on Earth.
The narrow constriction in the sea at 317°W, 67°N, about 17 km wide and similar in size to the Strait of Gibraltar, officially named Seldon Fretum, has been termed the 'Throat of Kraken' and suggested to be a location of significant currents. Titan's orbital eccentricity may lead to tides of 1 m in Kraken Mare, generating currents here of 0.5 m/s and possibly whirlpools.
As part of the proposed Titan Saturn System Mission, a probe would splash down on Kraken Mare in order to scrutinize its composition, depth and numerous other properties.