A large marine ecosystem is a vast aquatic ecosystem that encompasses multiple interconnected habitats and species that share common environmental conditions and resources. Synonyms for large marine ecosystem include oceanic biome, aquatic realm, marine bioregion, and marine province. Other synonymous terms include marine ecosystem, aquatic ecosystem, marine habitat, and oceanic environment. These terms are often used interchangeably to describe the diversity of marine life and ecosystems, including coral reefs, seagrass beds, kelp forests, and open ocean waters. Such ecosystems are critical for supporting the sustenance of marine species and regulating global climate patterns. Understanding the diversity and complexity of these environments is crucial for the conservation and preservation of marine biodiversity.