Tama Koshi is a river located in Japan, specifically in the Nagano Prefecture. It is known for its clear waters and beautiful scenery, making it a popular spot for outdoor activities such as fishing and hiking. The river flows through the mountainous terrain, contributing to the region's natural beauty. The Tama Koshi is also significant for its role in local ecosystems, supporting various wildlife. It is part of the larger Koshi River system, which plays a crucial role in the area's agriculture and water supply. The river's health is vital for maintaining the balance of the surrounding environment.