The Dviete ancient river valley is a unique territory of environmental, cultural and historical importance between Kaldabruņas, Bebrene and Dviete. The small Dviete River flows through the ancient river valley, through Lake Skuķi and Lake Dviete, and through the wetland meadows that are alongside the valley. During flooding season, these wetlands store up water from the Daugava River, rapidly absorbing masses of floodwater and then slowly returning the water to the river. The views during wet springs are incomparable to anything else that can be seen in Latvia. The specifics of the shifting water level in the ancient river valley are the reason why this is an important place for plants and birds during migration and nesting season. The Dviete Wetlands Nature Park has been set up to protect the territory. It is interesting that higher areas which do not disappear underwater during the floods are known as islands. Archaeologists who have studied the Dviete ancient river valley have found 15 possible settlements of the ancients (from the Stone Age, Bronze Age and Iron Age). They found a wealth of ancient objects of various kinds. There is reason to believe that this is one of the oldest and most important settlements in what is now southern Latvia.