term:

Reliction

reliction n

[Latin relictio act of leaving behind, from relinquere to leave behind]
1 : the gradual recession of water leaving land permanently uncovered
2 : land uncovered by reliction compare accretion

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.