Good for a hike from the highway, but its activity varies and you might just end up with a lot of dried out mud at the top. Nevertheless, the scenery is obvious.
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Отман-Боздаг
Far from the highway, but near the road. Last erupted in September 2018.
Last erupted in 2001, but nice for a visit and with a great view.
Qobustan is best known for its rock petroglyphs (a UNESCO World Heritage site) and mud volcanoes.
One of the most spectacular mud volcano parks near Baku with larger mud pools further behind, and for free, opposite the Qobustan National Historical-Artistic Reserve further north. Do not miss the mud lakes! When you arrive on the road there, you will find a variety of taxis in old Soviet Lada 4x4s who will take you to the actual mud volcano. You should pay 20-30 manat for the ride there. The taxis will start off asking for 100+ manat. Be firm that the correct price is 20 manat (per car, not per person).
Sumqayit is known for its industrial ruins. It offers some spectacular and picturesque sights, in the middle of which there is sometimes a herd of sheep. Beware of the dogs - if they get too close, pick up a stone (and throw), they will remember the last painful experience and run off.
Yanar Dağ, Burning Hillside
Yanar Dagh is a mountain whose natural gas vents have been aflame for a thousand years, even when it rains. Flames jet into the air from a thin, porous sandstone layer. A large touristy complex with small museum has been built around it, charging almost 5 times the price of 2017.