Kuivarahti

Kuivarahti is a geological term referring to a type of landform found in coastal regions, characterized by a long, narrow inlet that is partially or completely dried out at low tide. This feature is typically formed by the erosion of soft sediments, often by tidal action or the flow of freshwater. The term originates from Finnish, where "kuiva" means dry and "rahti" can refer to a strait or inlet.

These formations are common in areas with significant tidal ranges and soft, easily eroded coastlines. As the tide recedes, the water in the kuivarahti drains away, leaving the channel exposed and often muddy. At high tide, water flows back into the inlet, and the kuivarahti becomes submerged again. The size and depth of a kuivarahti can vary considerably, from small, shallow channels to larger, more extensive networks.

Ecologically, kuivarahti can be important habitats. The intertidal zones created by these inlets support a variety of plant and animal life adapted to fluctuating water levels and salinity. These can include specific types of algae, invertebrates, and bird species that forage in the exposed mudflats. The presence of kuivarahti can also influence sediment transport and deposition along the coast. Human activities, such as land reclamation or dredging, can alter the formation and function of kuivarahti.