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Marine ecoregions Freshwater ecoregions Ecoregions by region Ecoregions by landform Ecoregions by country Ecoregions by continent Joint development areas Economic regions of Europe Economic regions by country Transborder agglomerations Euroregions Cross-border regions Regional climate effects Palearctic realm Oceanian realm Nearctic realm Marine realms Australasian realm Antarctic realm Holarctic Ecology by biogeographic realm Biota by biogeographic realm Wheatbelt (Western Australia) Volcanic belts Green belts Gaza envelope Brigalow Belt Bible belts Belt regions of the United States Agricultural belts Belt regions Tokelau Tobago Sint Maarten Scotland Rotuma Puerto Rico Palestinian National Authority Northern Mariana Islands Norfolk Island Nevis Mount Athos Kurdistan Region (Iraq) Autonomous regions of Italy Autonomous regions of India Gagauzia Danish dependencies Curaçao Crown Dependencies Autonomous regions of China Autonomous Regions of Portugal Autonomous regions of Nicaragua Autonomous Region of Bougainville Autonomous communities of Spain Autonomous Administration of North and East Syria Aruba Åland Autonomous regions Regional airlines of the United States Regional airlines of Mexico Regional airlines of Japan European Regions Airline Association Defunct regional airlines Regional airlines of Canada Regional airline brands Regional Aviation Association of Australia