[1][2] It is beside Sulivan Bay, part of a channel that separates Bartolomé from nearby Santiago Island.
The rock is part of a now largely eroded volcanic dike that once connected the two islands.
Several endemic species of lichen in the genus Ramalina have been found on Pinnacle Rock.
[3] Travel writers describe the rock as one of the most spectacular views in the Islands.
[1][4][5][6][7] A colony of penguins makes its home at the foot of the rock.