Specifically, the entrance hall of the Great Cave of Dauģēni at the Mazsalaca parish collapsed some time in January or February, specialists say, shortening the cave by some 15 meters.
The cave is known as The Big X cave to foreign audiences.
The cave is still an estimated 330 meters long, which means it hasn't lost its title of being the longest cave in Latvia, and the Baltics.
Its neighboring cave, separated by just 12 meters of earth, is aptly called the Daugeni Small cave and holds the title of the second longest cave in the country, with 159 meters of cave to show for it.
Visitors are discouraged to visit the caves, as not only they are very dangerous in winter and spring, but also serve as a sleeping place for bats in winter. Bats should not be disturbed.
Barriers and warning signs have been set up at the site.