There isn't one specific word for being influenced by a body of water. The term depends on what aspect of influence you're referring to. Here are some options:

For geographic or environmental influence:

* Coastal: This describes a region or area that is located near a coast or body of water.

* Maritime: This term signifies a connection to the sea, often referring to activities or cultures associated with it.

* Aqueous: This word refers to something related to or consisting of water.

* Hydrographic: This term relates to the study and mapping of bodies of water.

For cultural or historical influence:

* Water-bound: This term emphasizes the influence of water on a society's development and activities.

* Water-dependent: This emphasizes the reliance of a society on water for survival or economic activity.

For specific impacts:

* Climate: Bodies of water significantly influence regional climates.

* Biodiversity: Water supports a vast array of life.

* Economy: Water is essential for agriculture, transportation, and industry.

Ultimately, the best word to use will depend on the specific context and the type of influence you are trying to convey.