This is a drawing of the transition from the atmosphere to the interior.
Click on image for full size
The Structure of Saturn's Interior
There is no surface to the giant planets, only a gradual change from the atmosphere, as shown in this drawing.
The gases which Saturn is mostly made of change to liquid inside Saturn, but the change is very gradual. Therefore the giant planets do not have strict layers, as the earth-like planets do.
The liquid sections of Saturn form by far the largest portions of the planet, and penetrate very deep into the planet. The first liquid layer inside Saturn, immediately under the atmosphere, is the liquid hydrogen layer. Under the liquid hydrogen layer is a liquid metallic hydrogen layer.
At the far interior is the core of Saturn.
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