The edge of the Kalapana lava flow. This area used to front Kaimu Bay, but the bay was completely filled in with lava in a matter of days.

Kaimu Bay in September 1990, a few days before it was destroyed. Lava is steaming in the distance.
Note the small tree behind the stop sign, which appears in the next photo...

The small tree serves as a reference point. The bay is now entirely filled with lava.

(More at VolcanoWorld)