Töömoyun (Kyrgyz: Төөмоюн, Russian: Туя-Муюн, romanized: Tuya-Moyun) is a mountain in the western part of the Osh Region of Kyrgyzstan. Situated near the left bank of the river Aravansay, its elevation is 1,403 m (4,603 ft).[1] It is near the village Kara-Koktu, between Nookat and Aravan. There are several karst caves on the slopes of the mountain, including Ajydaar-Üngkür,[2] the Baryte Cave[3] and the Fersman Cave.[4]