This large lava field, over 170 square miles (440 km²), erupted about 760,000 years ago, and was a slow and viscous lava which produced a very rough surface which made travel across it even more difficult.
This large lava field erupted about 760,000 years ago. This was over 170 square miles (440 km²). This large lava field was a slow and viscous lava. This was over 170 square miles (440 km²). These slow and viscous lava produced a very rough surface. This very rough surface made travel across it even more difficult.