General:
* Enclosed
* Encircled
* Ringed
* Hemmed in
* Besieged (implies a threatening or restrictive environment)
* Embraced (implies a positive or protective environment)
* Engulfed (suggests being completely covered or overwhelmed)
* Immersed (suggests being completely absorbed or surrounded by something)
Specific contexts:
* Flanked (when something is surrounded on both sides)
* Bounded (when something is surrounded by a specific boundary)
* Confined (when something is restricted or limited by its surroundings)
* Isolated (when something is separated from its surroundings)
* Inundated (when something is overwhelmed with a large quantity of something)
* Overwhelmed (when something is overpowered or engulfed by something else)
Figurative:
* Swept up in
* Engrossed in
* Immersed in
* Lost in
The best word to use will depend on the specific situation and the desired effect.