What legal concept relates to the gradual accumulation of land due to water action?

The correct choice reflects the legal concept of "accretion," which refers to the process through which land gradually accumulates due to the natural action of water, such as sediment deposits along rivers or coastlines. This process can lead to land being added to a property, increasing its size over time. In the context of property law, the principle of accretion plays a crucial role, as it can affect property boundaries and ownership rights. Landowners have rights to this newly formed land, allowing them to potentially increase their property holdings without the need for formal purchase or transfer agreements. Understanding accretion is vital for those involved in real estate and land management, as it helps clarify property rights and changes in land value due to natural processes.