Azure Lake is the first Zone in the Competition Mode of Sonic the Hedgehog 3.
Azure Lake is a small ruins-themed level that is overgrown with plant life, and the only real obstacles are a button that activates a Spring to push players back through the loops, and a segment that requires players to backtrack a bit to proceed if they go too high from the ramp. There is also a mud pit which is easy to avoid.
||Race around 360 degree loops and leap into the air as you run off of ramps in this waterfront region.
— Sonic the Hedgehog 3 US manual