The picture on the left is the lahar being eroded by the river with the volcano in the background. The image on the right is a picture of the bottom of trees that were buried by the lahar and date to about 1000 years ago.
The rim of the caldera appears to be breached by a lahar. Ground truth verifies that it is a lahar and their are "islands" of what appear to be parts of the caldera in the lahar.
The Volcán Barú (also Volcán de Chiriquí) is an active stratovolcano and the tallest mountain in Panama, at 3,475 metres (11,401 ft) high. It lies about 35 km off the border of Costa Rica.