Pennsylvania has of coastline along Lake Erie and of shoreline along the Delaware Estuary. It lies on the River Towy north of its estuary in Carmarthen Bay. Salinity in the Potomac River Estuary increases thereafter with distance downstream. St. Lucie estuary, and the Indian River Lagoon. The fish are the symbol of the Hudson River Estuary. Port Qasim is located east of the Port of Karachi on the Indus River estuary. Barrages are essentially dams across the full width of a tidal estuary. It was built on the estuary of the Wouri River. Antwerp stands at the upper end of the tidal estuary of the Scheldt. The tidal range can reach in Nantes, larger than at the mouth of the estuary. Landfall was made on the Essex coast near the Thames Estuary. Colonies have been found in European waters such as the Thames Estuary. It is named after the Gironde estuary, a major waterway. South Wales lies across the Severn estuary. The Dee Estuary, Aberdeen's harbour, has continually been improved.