Basking is a means of behavioral thermoregulation whereby turtles can achieve their preferred optimum body temperature. Basking areas can be as simple as a flat rock resting on submerged bricks, or a cinder block. More elaborate platforms can be built into the cage above water level with access via a plastic ramp or piece of wood. One can also use floating pieces of cork, hardwood driftwood, or plastic floating platforms. The basking area should be large enough for all turtles to completely emerge from the water and secure enough that it won't topple and trap a turtle under water.
Some species are agile climbers so be sure to include a screen top to prevent escape.
Snapping turtles and mata matas don't need basking areas. Nesting areas should be provided if adult female turtles are kept. Even if conspecific males are not present females may still lay eggs which may or may not be viable. If a sufficient nest area is provided, dystocia may be avoided and oviposition stimulated. The nesting area should be approximately 4 to 5 times larger than the carapace of the female.