Mt lamongan is located between 2 complexes of volcano, Tengger complex on the west and Iyang complex on the east. Mt Lamongan (1668 meters) is categorized as one of 21 volcano in Indonesia in Class A, that at least erupts magmatic eruption one time since 1600. This volcano is recorded to explode in 1799. And even until 1889, this volcano held record as volcano that most frequently explode. Lamongan was higly active volcano, but the record was taken over by Mt Semeru. Last eruption was on 2012.
This mountain is unique, different than other mountain in Java. If you climb to the top, there is a very nice scenery. From distance Mt Semeru looks amazing and tectonic lake on foot of Mt. Lamongan is also visible.
In geology and volcanology, tectonic lake is known as maar. Maar was created for volcanic explosion with round shape and steep wall. Maar was formed by freatic and freato magmatic explosion. In 1907, until today there are 10 maar on earth. But in the prehistoric period, there were many maar created. The biggest and most amazing maar was created at Pematang Bata, in 1933. 2 maar with 1 km and 2 km diameter. Maar is a very rare phenomenon. Until today, Volcanology directorate has not detected maar activity of Mt Lamongan.
Climbing Mt Lamongan started from Klakah, and before starting the trip, usually climbers rest at papringan villagge where there is spring for water supply. From Klakah to Papringan only take one hour walk. From Papringan, climbers can meet Mbah Citro, and it takes one hour to get to his place. And climbing can be started at night. Climbing can be started at 22.00, around 23.00 you will arrive at Watu Gede with flat track. At Watugede, climbers can rest here for 1 or 2 hours. At 01.00, the climbing can be proceeded. After passing steep rocky track, then fern forest is the next route. Usually climbers will arive at 09.00 at the top and see the sunrise and beauty of Mt Raung, Argopuro, Semeru and Tengger complex.