The 'A Mar' clams are a delicacy from the Northwest Atlantic, specifically from the area known as 'Three Rivers' in Wales. This location, where the rivers Towy, Taf, and Gwendraeth converge, flows into Carmarthen Bay, part of the Celtic Sea. The clams are packed in water and salt, preserving their freshness and characteristic flavor. These seafood can contain traces of fish and shellfish, making them ideal for a variety of dishes that seek the authentic taste of the sea. Remember that they contain mollusks, which makes them perfect for seafood lovers.