Carmarthen Bay is a broad, shallow coastal inlet on the South Wales coast, forming a significant part of the Pembrokeshire Coast National Park. This fertile bay is characterized by its extensive sandy beaches, expansive mudflats exposed at low tide, and the large estuaries of several major rivers, including the Tywi, Taf, Gwendraeth, and Loughor. The coastline is a mix of long, stretching sands and historic castle points, with the entire perimeter linked by the Wales Coast Path. The bay's waters are relatively shallow, with predominant depths less than 30 meters in its outer reaches. Water temperatures follow a seasonal pattern, warming from July through October, with the warmest conditions typically in August, and cooling from December through April, with the coldest averages around February.