It is called an Ecotone.
An ecotone can be described as the meeting point of two different biomes. It is usually referred to as a transition zone.
An ecotone is characterized by mixed characteristics or intermediate conditions that are quite different from the two adjoining biomes.
An example of an ecotone is the mangrove forest. The mangrove forest is an integration of terrestrial and marine ecosystem. Other examples of an ecotone include grassland, marshland, among others.
Therefore, the area of land where two major biomes meet and interact is called an ecotone.
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