Mongolia's main river is in danger of drying up due to a continuous drought, prompting the government to call for water-saving measures.

Minister of Nature, Environment and Tourism Damdin Tsogtbaatar made the appeal on Tuesday after visiting the Tula River, which has seen some sections of its riverbed exposed.

Tula is the most important domestic water source for residents in the country's capital. Its drying up not only affects Ulan Bator's environment but also threatens the water supply for more than 100 million residents, nearly half the country's population.

The long-lasting drought and increasing desertification and reduced vegetation along the river were believed to be the main causes.