Lava Flows Over Both Protective Walls Photo/Einar Falur Lava is now flowing over both protective walls that had been built near the eruption site by Fagradalsfjall mountain, Southwest Iceland, mbl.is reports. The walls had been built to slow down the lava flow, which is headed into Nátthagi valley. (See our earlier report here ). Should the lava continue flowing that way, it will eventually threaten a fiber optic cable for the Reykjanes peninsula and, finally, Suðurstrandarvegur road, which lies along the south coast of the peninsula. Ármann Höskuldsson, volcanologist at the University of Iceland, believes it will take a few weeks before Nátthagi valley fills up with lava, opening the way for the lava stream toward Suðurstrandarvegur road.