All Marine and Coastal Landforms (World)

This group collects the 28 Landforms subcategory members that the atlas already places under its own Marine and Coastal Landforms subcategory, the whole real-world population the atlas covers there. It is a single flat group, not split further by region or country, because Marine and Coastal Landforms stays well under the atlas's own hundred-member threshold for a further split. It sits directly under the Marine and Coastal Landforms subcategory and under the atlas's own Groups category, giving a reader a direct browse path from either the Marine and Coastal Landforms subcategory page or the Groups index.