A spring is a single unit of liquid that generates within the world, flowing out into spaces level with or lower than the source. There are three main categories of fluid springs.
Types of springs
This most familiar type of spring can generate as either water or lava, and generate in the sides of stone surfaces. These are commonly encountered on the sides of cliffs, as well as inside caves. Lava springs are a common source of forest fires.
Normal springs do not generate above a certain altitude[until JE 1.18] or Y=192.[upcoming: JE 1.18] If the Caves & Cliffs experimental gameplay toggle is enabled in Bedrock Edition, springs are unable to generate below Y=0, though runoff from them is able to flow below that height.
These types of springs are exclusive to the Nether, and generate only as lava. As their name implies, they generate on ceilings, and the liquid flows directly downwards from them. These are quite common sightings in the Nether, and the resultant lava spreading can sometimes make traversing terrain difficult.
Unlike the other types of springs, these are hidden from generation. These are particularly dangerous and care must be taken (like taking a Potion of Fire Resistance) when mining in the Nether, as they can be dangerous when uncovered.
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|Java Edition Infdev|
|Java Edition Alpha|
|v1.2.0||preview||Added the Nether, which contains ceiling springs.|
|1.5||13w02a||Added hidden lava in the Nether.|
|1.17||21w08a||Normal springs are now able to generate below Y=0.|
|21w15a||Normal springs are no longer able to generate below Y=0.|
|Upcoming Java Edition|
|1.18||Experimental Snapshot 1||Normal springs are able to generate below Y=0 once again.|
|experimental snapshot 5||Water springs are now able to replace dirt and snow blocks.|
|Springs are now able to generate in lush caves.|
|experimental snapshot 6||Water springs are slightly less common.|
|21w42a||The maximum Y-level of water spring generation has been changed to Y=192.|
|Water springs have been made slightly less common again.|
|Lava springs are now able to generate in mountains and snowy terrain.|
|Pocket Edition Alpha|
|v0.12.1||build 1||Added the Nether, which contains ceiling springs and hidden lava.|