The Indigirka River is a major river that runs through the Sakha Republic in Russia. It is also known by several synonyms, including the Yndykha River, the Indigirskaya River, and the Yudan River. The river has a total length of 1,726 kilometers and flows into the East Siberian Sea. The river is an important transportation route for villages and towns along its banks, and it plays a crucial role in the local economy. The Indigirka River is also known for its rich biodiversity and is home to several rare and endangered species of fish.