The boundaries of the ecosystem shown in the diagram represents a body of water in the outer region.
What is an Ecosystem?This consists of all the organisms and the physical environment with which they interact and are made up of the biotic and abiotic factors.
Boundary of an ecosystem complex of living organisms in areas where one body of water meets another or where one terrestrial ecosystem meets another and in this case it is the body of water which have fishes and other aquatic organisms present.
Read more about Ecosystem here https://brainly.com/question/842527
#SPJ1