Those are #iceberg fragments broken off from the nearby Jökulsárlón #glacier.
These are Barnacle Geese swimming on Jokulsarlon Glacier Lagoon in southern Iceland. Jokulsarlon Glacier is on the far side of the lagoon. The ice breaks off and floats across the lagoon and sometimes out to sea through a small channel. The ice is magnificent in shades of white to blue. The black is lava ash. The geese were all resting on shore and just as we were about to leave by car they decided to leave by lagoon. They all walked to the edge and swam off, making this shot that much more unique.