A sea inlet is a body of water that connects to the ocean and is partially enclosed by land. The term can be broken down into four parts: ARM (3 letters), RIA (3 letters), ESTUARY (7 letters), and BAY (3 letters). An ARM is a narrow stretch of water, a RIA is a drowned river valley, an ESTUARY is a partially enclosed coastal body of water where fresh and salt water mix, and a BAY is a body of water partially surrounded by land.