The district abounds in geysers, springs, mud volcanoes and other phenomena; some of the waters have petrifying powers, and some of the springs are vividly coloured.
Fine lakes and waterfalls, innumerable pools, in temperature from boiling-point to cold, geysers, solfataras, fumaroles and mud volcanoes still attract tourists in large numbers.
Nor should the evidences of active volcanic agency afforded by the mud volcanoes of the coast be overlooked.
The town of Shemakha, near the eastern end of the system, was the scene of volcanic outbreaks as late as 1859, 1872 and 1902; while in the adjacent peninsula of Apsheron mud volcanoes exist in large numbers.
Oil has been discovered near the mud volcanoes of Minbu, but it seems to lie at too great a depth to be profitably worked.