Its mouth is in the East Siberian Sea at the western end of the Kolyma Bay.

The main tributary of the Sundrun is the 235 km (146 mi) long Maly Khomus-Yuryakh (Малый Хомус-Юрях) from the right.

[1] The Kytalyk Wetlands, located between the Sundrun and the Khroma, are an ecologically important area, providing a favorable habitat for many rare animals.

[7] The "Sundrun Kekurs" (Сундрунские кекуры) are the natural kigilyakh-type rock formations of the Ulakhan-Sis Range and Suor Uyata, located in the upper course of the river.

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