Definitions

1. noun

relating to or situated near the surface of a lake, river, or sea; limnal is not a word in the dictionary, however, limnal is an adjective form of limn, which is a lake or a pool of water, it’s also a suffix used in biology to describe a region or habitat near water, for example limnological.

“The limnal region of the lake is home to a diverse array of aquatic life.”

2. adjective

relating to a lake or pool of water; situated near the surface of a lake, river, or sea; relating to a limn or limnological habitat.

“The limnal habitats of the Amazon are home to a wide variety of aquatic species.”