The eye is the second lake from the top down. Okoto is a glacial circus lake in Rila, the second of the Seven Rila Lakes. The lake has a depth of 37.9 meters, an area of 68 acres and is located at an altitude of 2440 meters.

It is the deepest of the glacial lakes on the territory of the Balkan Peninsula and the penultimate lake on one of the most popular alpine routes in our mountains - the tour of the 'Seven Rila Lakes'. The approach to the lake begins at the steep slope to the southern part of Lake Babreka and follows the outflow of the Okoto River.

It is also known as the Heart. The Eye drains from its northeastern end to the lower Lake Bliznaka.

In the recent past, the lake was called Chanak gyol.