Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

The Po delta, Emilia-Romagna, Italy, Europe

Hamerkop (Scapus umbretta), Khwai Concession Area, Okavango Delta, Botswana, Africa

Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

Storm surge barrier, Delta Works, Zeeland, Holland, Netherlands, Europe

Overlooking High Above An Intense Blue Coloured Lake With Delta Shoreline, Banff National Park, Alberta, Canada

The silty water of the Tanana River meets the clear water of Clearwater River in Delta Junction, Alaska, United States of America

House and foliage along the Red River, Red River Delta; Ninh Binh, Vietnam

Coconuts at a coconut processing family owned business in the Mekong Delta, Ben Tre, Vietnam

A group of kayakers paddles on the Tanana River near Delta Junction; Alaska, United States of America

A man smoking a cigarette while fishing from his boat on the Mekong River, Mekong Delta, Thoi An, Can Tho, Vietnam