Utah Lake, located in Utah Lake State Park, Utah, is the largest fresh-water lake in the state at 96,600 acres (390 km²). The lake dominates Utah Valley, with major cities like Provo and Orem hemmed between the lake's eastern shore and the Wasatch Mountains.

The lake itself is not very deep, and suffers from large seasonal algae blooms, which are compounded by industrial effluent from a steel mill (now-defunct) located on its eastern shore. Activities include boating, sailing, waterskiing, and fishing.

It is fed by creeks and streams as well as the Provo River .