Triple Delta, of three large and some smaller rivers that flow into the Thermaikos gulf. Rivers have been arranged by ditches, especially in the south. The Aliakmonas Delta still has extensive saltwater marshes with small lagoons. There are extensive coastal mudflats and shallow tidal marine action slightly exposes them. There are riparian forests and reed beds cut off and more often upstream. The land in the Delta region is mainly used as rice paddies.

Having low tides and northerly winds it is the most important area in Greece for waterfowl and seagulls, especially during migration. There are heron colonies in forests and reedbeds and one of the remaining populations of Plegadis falcinellus (Chalkokota). The paddy fields are a feeding ground for herons, waders, terns, gulls and Glareola pratincola (Water swallow). There are nesting areas in the adjacent natural zones. Despite the changes, the wetland is still capable of supporting a rich variety of birds. Significant populations overwinter. The largest concentration of Himantopus himantopus (Kalamokanas) and Glareola pratincola (Nerochelidono) in Greece.

Due to its great ecological importance, the area of Delta Axios – Loudia – Aliakmonas is included in the network of protected areas of Europe Natura 2000 and is protected by the International Ramsar Convention on Wetlands.
The protection status came mainly in recognition of its great ornithological value.

Important populations of rare and endangered birds such as the white-tailed eagle, the black-headed gull, the coot, the silver pelican, the tern, the black heron and many other species of birds roost, nest or winter here.
But apart from the birds, one can still see the hare and the wild horses, enjoy a walk in the riverside forest of Axios or Aliakmons, visit the beautiful observatory of Agathoupolis, or simply enjoy a view of Thermaikos and Thessaloniki …
The opportunities for walking, observation, photography or simply escaping from the noise of the city are many. All seasons offer something special: winter with the impressive concentrations of waterfowl and raptors in Agathoupolis, spring with the chirping of birds and herds of horses in the shady riverside forests, summer with the cool walks near the coast and the autumn with the large flocks of waterfowl in the lagoon of Kalochori and Aliki Kitrous.