We have generated the first, complete geomorphologic map of Titan's polar regions.

Most of Titan's lake depressions can be found with a single plains unit, suggesting that the unit is conducive to the formation of such features.

Uplands materials are not uniform in composition, where mountains and dissected uplands have different radar backscattering behaviors.

The observed landscape appears as an underlying bedrock material that was mantled by vast sedimentary deposits. Superposed on these sedimentary deposits are steep-sided depressions, canyons and seas.

We offer a conceptual model that is able to explain the distribution and superposition relationships among our map units, where in Titan's distant past the poles were submerged under larger liquid bodies.