Final answer:
The southeastern part of Florida, including Miami-Dade, Broward, and Palm Beach counties, experiences the least number of sinkholes due to geological conditions such as dense limestone with a cap of impermeable material.
Step-by-step explanation:
The part of Florida that has the least amount of sinkholes is the southeastern region, including counties such as Miami-Dade, Broward, and Palm Beach. Sinkholes are less common in this area because the geological conditions such as the type of rock formations and aquifer characteristics are less conducive to their formation. The bedrock in southeastern Florida is made up of dense limestone with a cap of impermeable material that reduces the amount of water infiltration necessary to create sinkholes.
Sinkhole activity is more commonly associated with regions underlain by carbonate rocks such as limestone that can be dissolved by groundwater, a process that is part of what geologists call 'karst' terrain. Central Florida, for example, has a high frequency of sinkholes due to its karst topography. While sinkholes can occur throughout the state, understanding regional geological differences is important for property owners, city planners, and insurers.