Estuary/ˈestʃueri/ Definition 1 of 1Pro Tip 1/3Ecological Significance Estuaries are vital for the environment and often referenced in ecological or conservation contexts. The estuary is a nursery for many marine species. Pro Tip 2/3Cultural Associations Estuaries may have cultural or historical importance, featuring in local folklore or history. The ancient battle occurred near the river estuary. Pro Tip 3/3Commerce and Trade Estuaries are often hubs of commerce and trade due to their accessibility for ships. The port is located on the estuary, bustling with trade.